diff --git a/.gitignore b/.gitignore
index 77104d20a..6b4fd25c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,7 @@ public/react/yarn.lock
 /.idea/*
 
 # Ignore react node_modules
+public/system/*
 public/react/*
 /public/react/.cache
 /public/react/node_modules/
@@ -82,4 +83,5 @@ docker/
 educoder.sql
 redis_data/
 Dockerfile
-dump.rdb
\ No newline at end of file
+dump.rdb
+.tags*
diff --git a/Gemfile b/Gemfile
index 281dd705a..713eb860f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -126,3 +126,5 @@ gem 'request_store'
 gem 'harmonious_dictionary', '~> 0.0.1'
 
 gem 'parallel', '~> 1.19', '>= 1.19.1'
+
+gem 'letter_avatar'
diff --git a/Gemfile.lock b/Gemfile.lock
index cbd598f59..015c0a515 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -162,6 +162,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.0)
     kaminari-core (1.2.0)
+    letter_avatar (0.3.8)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -456,6 +457,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   kaminari (~> 1.1, >= 1.1.1)
+  letter_avatar
   listen (>= 3.0.5, < 3.2)
   mysql2 (>= 0.4.4, < 0.6.0)
   oauth2
diff --git a/app/controllers/organizations/organizations_controller.rb b/app/controllers/organizations/organizations_controller.rb
index 73335cf11..09c12fd5a 100644
--- a/app/controllers/organizations/organizations_controller.rb
+++ b/app/controllers/organizations/organizations_controller.rb
@@ -25,6 +25,7 @@ class Organizations::OrganizationsController < Organizations::BaseController
 
   def create
     ActiveRecord::Base.transaction do
+      Organizations::CreateForm.new(organization_params).validate!
       @organization = Organizations::CreateService.call(current_user, organization_params)
       Util.write_file(@image, avatar_path(@organization)) if params[:image].present?
     end
diff --git a/app/controllers/organizations/teams_controller.rb b/app/controllers/organizations/teams_controller.rb
index 5bc01fe39..a8d06ce46 100644
--- a/app/controllers/organizations/teams_controller.rb
+++ b/app/controllers/organizations/teams_controller.rb
@@ -33,7 +33,10 @@ class Organizations::TeamsController < Organizations::BaseController
   end
 
   def create
-    @team = Organizations::Teams::CreateService.call(current_user, @organization, team_params)
+    ActiveRecord::Base.transaction do
+      Organizations::CreateTeamForm.new(team_params).validate!
+      @team = Organizations::Teams::CreateService.call(current_user, @organization, team_params)
+    end
   rescue Exception => e
     uid_logger_error(e.message)
     tip_exception(e.message)
@@ -60,7 +63,7 @@ class Organizations::TeamsController < Organizations::BaseController
 
   private
   def team_params
-    params.permit(:name, :description, :authorize, :includes_all_project, :can_create_org_project, :unit_types => [])
+    params.permit(:name, :nickname, :description, :authorize, :includes_all_project, :can_create_org_project, :unit_types => [])
   end
 
   def load_organization
diff --git a/app/forms/organizations/create_form.rb b/app/forms/organizations/create_form.rb
new file mode 100644
index 000000000..00c1dd15e
--- /dev/null
+++ b/app/forms/organizations/create_form.rb
@@ -0,0 +1,8 @@
+class Organizations::CreateForm < BaseForm
+  NAME_REGEX = /^(?!_)(?!.*?_$)[a-zA-Z0-9_-]+$/ #只含有数字、字母、下划线不能以下划线开头和结尾
+  attr_accessor :name, :description, :website, :location, :repo_admin_change_team_access, :visibility, :max_repo_creation, :nickname
+
+  validates :name, :nickname, :visibility, presence: true
+  validates :name, format: { with: NAME_REGEX, multiline: true, message: "只能含有数字、字母、下划线且不能以下划线开头和结尾" }
+
+end
diff --git a/app/forms/organizations/create_team_form.rb b/app/forms/organizations/create_team_form.rb
new file mode 100644
index 000000000..898d69a1d
--- /dev/null
+++ b/app/forms/organizations/create_team_form.rb
@@ -0,0 +1,8 @@
+class Organizations::CreateTeamForm < BaseForm
+  NAME_REGEX = /^(?!_)(?!.*?_$)[a-zA-Z0-9_-]+$/ #只含有数字、字母、下划线不能以下划线开头和结尾
+  attr_accessor :name, :nickname, :description, :authorize, :includes_all_project, :can_create_org_project, :unit_types
+
+  validates :name, :nickname, :authorize, presence: true
+  validates :name, format: { with: NAME_REGEX, multiline: true, message: "只能含有数字、字母、下划线且不能以下划线开头和结尾" }
+
+end
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 30953bf57..b22954bb1 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -144,17 +144,12 @@ module ApplicationHelper
     if File.exist?(disk_filename(source&.class, source&.id))
       ctime = File.ctime(disk_filename(source.class, source.id)).to_i
       if %w(User Organization).include?(source.class.to_s)
-        File.join(relative_path, ["#{source.class}", "#{source.id}"]) + "?t=#{ctime}"
+        File.join("images", relative_path, ["#{source.class}", "#{source.id}"]) + "?t=#{ctime}"
       else
         File.join("images/avatars", ["#{source.class}", "#{source.id}"]) + "?t=#{ctime}"
       end
     elsif source.class.to_s == 'User'
-      str = source.user_extension.try(:gender).to_i == 0 ? "b" : "g"
-      File.join(relative_path, "#{source.class}", str)
-    elsif source.class.to_s == 'Subject'
-      File.join("images","educoder", "index", "subject", "subject#{rand(17)}.jpg")
-    elsif source.class.to_s == 'Shixun'
-      File.join("images","educoder", "index", "shixun", "shixun#{rand(23)}.jpg")
+      source.get_letter_avatar_url
     end
   end
 
diff --git a/app/helpers/projects_helper.rb b/app/helpers/projects_helper.rb
index b212b50e4..aec4b38d7 100644
--- a/app/helpers/projects_helper.rb
+++ b/app/helpers/projects_helper.rb
@@ -90,8 +90,4 @@ module ProjectsHelper
   def render_educoder_avatar_url(project_educoder)
     [Rails.application.config_for(:configuration)['educoder']['cdn_url'], project_educoder&.image_url].join('/')
   end
-
-  def render_avatar_url(owner)
-    ['images', url_to_avatar(owner)].join('/')
-  end
 end
diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 461c835fe..1ca173458 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -17,7 +17,7 @@
 #  disk_directory            :string(255)
 #  attachtype                :integer          default("1")
 #  is_public                 :integer          default("1")
-#  copy_from                 :integer
+#  copy_from                 :string(255)
 #  quotes                    :integer          default("0")
 #  is_publish                :integer          default("1")
 #  publish_time              :datetime
@@ -26,15 +26,15 @@
 #  cloud_url                 :string(255)      default("")
 #  course_second_category_id :integer          default("0")
 #  delay_publish             :boolean          default("0")
+#  link                      :string(255)
+#  clone_id                  :integer
 #
 # Indexes
 #
 #  index_attachments_on_author_id                        (author_id)
+#  index_attachments_on_clone_id                         (clone_id)
 #  index_attachments_on_container_id_and_container_type  (container_id,container_type)
-#  index_attachments_on_course_second_category_id        (course_second_category_id)
 #  index_attachments_on_created_on                       (created_on)
-#  index_attachments_on_is_public                        (is_public)
-#  index_attachments_on_quotes                           (quotes)
 #
 
 class Attachment < ApplicationRecord
diff --git a/app/models/chart_rule.rb b/app/models/chart_rule.rb
index a0b344e07..26c7f8084 100644
--- a/app/models/chart_rule.rb
+++ b/app/models/chart_rule.rb
@@ -1,3 +1,21 @@
+# == Schema Information
+#
+# Table name: chart_rules
+#
+#  id                   :integer          not null, primary key
+#  rule_type            :string(255)
+#  content              :text(65535)
+#  created_at           :datetime         not null
+#  updated_at           :datetime         not null
+#  competition_id       :integer
+#  competition_stage_id :integer
+#
+# Indexes
+#
+#  index_chart_rules_on_competition_id        (competition_id)
+#  index_chart_rules_on_competition_stage_id  (competition_stage_id)
+#
+
 class ChartRule < ApplicationRecord
 
   validates :content, length: { maximum: 1000, too_long: "不能超过1000个字符" }
diff --git a/app/models/ci/stage.rb b/app/models/ci/stage.rb
index 2309f05d4..536e51cf6 100644
--- a/app/models/ci/stage.rb
+++ b/app/models/ci/stage.rb
@@ -1,3 +1,22 @@
+# == Schema Information
+#
+# Table name: stages
+#
+#  id            :integer          not null
+#  subject_id    :integer
+#  name          :string(255)
+#  description   :text(65535)
+#  user_id       :integer
+#  position      :integer
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#  shixuns_count :integer          default("0")
+#
+# Indexes
+#
+#  index_stages_on_subject_id  (subject_id)
+#
+
 class Ci::Stage < Ci::RemoteBase
   self.primary_key = 'stage_id'
 
diff --git a/app/models/ci/user.rb b/app/models/ci/user.rb
index cd6246753..fc82596c4 100644
--- a/app/models/ci/user.rb
+++ b/app/models/ci/user.rb
@@ -39,13 +39,14 @@
 #  business                   :boolean          default("0")
 #  profile_completed          :boolean          default("0")
 #  laboratory_id              :integer
-#  platform                   :string(255)      default("0")
-#  gitea_token                :string(255)
-#  gitea_uid                  :integer
 #  is_shixun_marker           :boolean          default("0")
+#  admin_visitable            :boolean          default("0")
+#  collaborator               :boolean          default("0")
+#  gitea_uid                  :integer
 #  is_sync_pwd                :boolean          default("1")
 #  watchers_count             :integer          default("0")
 #  devops_step                :integer          default("0")
+#  gitea_token                :string(255)
 #
 # Indexes
 #
@@ -53,8 +54,9 @@
 #  index_users_on_homepage_engineer  (homepage_engineer)
 #  index_users_on_homepage_teacher   (homepage_teacher)
 #  index_users_on_laboratory_id      (laboratory_id)
-#  index_users_on_login              (login)
-#  index_users_on_mail               (mail)
+#  index_users_on_login              (login) UNIQUE
+#  index_users_on_mail               (mail) UNIQUE
+#  index_users_on_phone              (phone) UNIQUE
 #  index_users_on_type               (type)
 #
 
diff --git a/app/models/concerns/.keep b/app/models/concerns/.keep
deleted file mode 100644
index e69de29bb..000000000
diff --git a/app/models/discuss.rb b/app/models/discuss.rb
index a4c833b55..1a2efc606 100644
--- a/app/models/discuss.rb
+++ b/app/models/discuss.rb
@@ -1,3 +1,38 @@
+# == Schema Information
+#
+# Table name: discusses
+#
+#  id              :integer          not null, primary key
+#  user_id         :integer
+#  dis_type        :string(255)
+#  dis_id          :integer
+#  content         :text(65535)
+#  parent_id       :integer
+#  root_id         :integer
+#  praise_count    :integer
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  challenge_id    :integer
+#  reward          :integer
+#  hidden          :boolean          default("0")
+#  last_reply_id   :integer
+#  position        :integer
+#  praises_count   :integer          default("0")
+#  sticky          :boolean          default("0")
+#  course_sticky   :boolean          default("0")
+#  course_hidden   :boolean          default("0")
+#  copy_message_id :integer
+#
+# Indexes
+#
+#  index_discusses_on_challenge_id         (challenge_id)
+#  index_discusses_on_copy_message_id      (copy_message_id)
+#  index_discusses_on_course_hidden        (course_hidden)
+#  index_discusses_on_course_sticky        (course_sticky)
+#  index_discusses_on_dis_id_and_dis_type  (dis_id,dis_type)
+#  index_discusses_on_user_id              (user_id)
+#
+
 class Discuss < ApplicationRecord
   default_scope { order(created_at: :desc) }
 
diff --git a/app/models/forge_activity.rb b/app/models/forge_activity.rb
index 77103d0ff..b9f11c5a8 100644
--- a/app/models/forge_activity.rb
+++ b/app/models/forge_activity.rb
@@ -1,5 +1,24 @@
+# == Schema Information
+#
+# Table name: forge_activities
+#
+#  id             :integer          not null, primary key
+#  user_id        :integer
+#  project_id     :integer
+#  forge_act_id   :integer
+#  forge_act_type :string(255)
+#  org_id         :integer
+#  created_at     :datetime         not null
+#  updated_at     :datetime         not null
+#
+# Indexes
+#
+#  forge_act_index                         (project_id,forge_act_id,created_at,forge_act_type)
+#  index_forge_activities_on_forge_act_id  (forge_act_id)
+#
+
 class ForgeActivity < ApplicationRecord
   belongs_to :user
   belongs_to :project
   belongs_to :forge_act, polymorphic: true
-end
\ No newline at end of file
+end
diff --git a/app/models/help.rb b/app/models/help.rb
index 2b8bf5813..5a4c480b4 100644
--- a/app/models/help.rb
+++ b/app/models/help.rb
@@ -1,3 +1,17 @@
+# == Schema Information
+#
+# Table name: helps
+#
+#  id          :integer          not null, primary key
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#  about_us    :text(65535)
+#  agreement   :text(65535)
+#  status      :text(65535)
+#  help_center :text(65535)
+#  join_us     :text(65535)
+#
+
 class Help < ApplicationRecord
 
-end
\ No newline at end of file
+end
diff --git a/app/models/laboratory.rb b/app/models/laboratory.rb
index 73002a841..9d3ca07dd 100644
--- a/app/models/laboratory.rb
+++ b/app/models/laboratory.rb
@@ -10,6 +10,12 @@
 #  sync_course  :boolean          default("0")
 #  sync_subject :boolean          default("0")
 #  sync_shixun  :boolean          default("0")
+#  is_local     :boolean          default("0")
+#
+# Indexes
+#
+#  index_laboratories_on_identifier  (identifier) UNIQUE
+#  index_laboratories_on_school_id   (school_id)
 #
 
 class Laboratory < ApplicationRecord
diff --git a/app/models/laboratory_setting.rb b/app/models/laboratory_setting.rb
index 5013dd547..61c677def 100644
--- a/app/models/laboratory_setting.rb
+++ b/app/models/laboratory_setting.rb
@@ -6,6 +6,10 @@
 #  laboratory_id :integer
 #  config        :text(65535)
 #
+# Indexes
+#
+#  index_laboratory_settings_on_laboratory_id  (laboratory_id)
+#
 
 class LaboratorySetting < ApplicationRecord
   belongs_to :laboratory
diff --git a/app/models/license.rb b/app/models/license.rb
index dcd5528fb..0a14fb85e 100644
--- a/app/models/license.rb
+++ b/app/models/license.rb
@@ -7,7 +7,6 @@
 #  content    :text(65535)
 #  created_at :datetime         not null
 #  updated_at :datetime         not null
-#  is_secret  :boolean          default("0")
 #
 
 class License < ApplicationRecord
diff --git a/app/models/live_link.rb b/app/models/live_link.rb
index 9c6531f87..c1c0bf750 100644
--- a/app/models/live_link.rb
+++ b/app/models/live_link.rb
@@ -1,3 +1,27 @@
+# == Schema Information
+#
+# Table name: live_links
+#
+#  id          :integer          not null, primary key
+#  course_id   :integer
+#  user_id     :integer
+#  url         :string(255)
+#  description :text(65535)
+#  on_status   :boolean          default("0")
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#  course_name :string(255)
+#  platform    :string(255)
+#  live_time   :datetime
+#  duration    :integer
+#  position    :integer
+#
+# Indexes
+#
+#  index_live_links_on_course_id  (course_id)
+#  index_live_links_on_user_id    (user_id)
+#
+
 class LiveLink < ApplicationRecord
   # belongs_to :course
   belongs_to :user
diff --git a/app/models/member.rb b/app/models/member.rb
index 408710a03..e72ae7c6b 100644
--- a/app/models/member.rb
+++ b/app/models/member.rb
@@ -11,7 +11,6 @@
 #  course_group_id     :integer          default("0")
 #  is_collect          :integer          default("1")
 #  graduation_group_id :integer          default("0")
-#  is_apply_signature  :boolean          default("0")
 #
 # Indexes
 #
diff --git a/app/models/message_detail.rb b/app/models/message_detail.rb
index 51f4b17a9..c009b4744 100644
--- a/app/models/message_detail.rb
+++ b/app/models/message_detail.rb
@@ -1,3 +1,18 @@
+# == Schema Information
+#
+# Table name: message_details
+#
+#  id         :integer          not null, primary key
+#  content    :text(4294967295)
+#  message_id :integer
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+# Indexes
+#
+#  index_message_details_on_message_id  (message_id)
+#
+
 class MessageDetail < ApplicationRecord
   # belongs_to :message, :touch => true
   validates :content, length: { maximum: 10000, too_long: "内容不能超过10000个字符" }
diff --git a/app/models/organization.rb b/app/models/organization.rb
index 48dab55a2..fbf3def79 100644
--- a/app/models/organization.rb
+++ b/app/models/organization.rb
@@ -39,13 +39,14 @@
 #  business                   :boolean          default("0")
 #  profile_completed          :boolean          default("0")
 #  laboratory_id              :integer
-#  platform                   :string(255)      default("0")
-#  gitea_token                :string(255)
-#  gitea_uid                  :integer
 #  is_shixun_marker           :boolean          default("0")
+#  admin_visitable            :boolean          default("0")
+#  collaborator               :boolean          default("0")
+#  gitea_uid                  :integer
 #  is_sync_pwd                :boolean          default("1")
 #  watchers_count             :integer          default("0")
 #  devops_step                :integer          default("0")
+#  gitea_token                :string(255)
 #
 # Indexes
 #
@@ -53,8 +54,9 @@
 #  index_users_on_homepage_engineer  (homepage_engineer)
 #  index_users_on_homepage_teacher   (homepage_teacher)
 #  index_users_on_laboratory_id      (laboratory_id)
-#  index_users_on_login              (login)
-#  index_users_on_mail               (mail)
+#  index_users_on_login              (login) UNIQUE
+#  index_users_on_mail               (mail) UNIQUE
+#  index_users_on_phone              (phone) UNIQUE
 #  index_users_on_type               (type)
 #
 
diff --git a/app/models/project.rb b/app/models/project.rb
index 9aa6283f6..da1a8615b 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -37,8 +37,6 @@
 #  rep_identifier         :string(255)
 #  project_category_id    :integer
 #  project_language_id    :integer
-#  license_id             :integer
-#  ignore_id              :integer
 #  praises_count          :integer          default("0")
 #  watchers_count         :integer          default("0")
 #  issues_count           :integer          default("0")
@@ -52,8 +50,11 @@
 #  open_devops_count      :integer          default("0")
 #  recommend              :boolean          default("0")
 #  platform               :integer          default("0")
+#  license_id             :integer
+#  ignore_id              :integer
 #  default_branch         :string(255)      default("master")
 #  website                :string(255)
+#  lesson_url             :string(255)
 #
 # Indexes
 #
@@ -70,10 +71,6 @@
 #  index_projects_on_updated_on              (updated_on)
 #
 
-
-
-
-
 class Project < ApplicationRecord
   include Matchable
   include Publicable
@@ -161,6 +158,7 @@ class Project < ApplicationRecord
 
   #创建项目管理员
   def check_project_members
+    return if owner.is_a?(Organization)
     unless members.present? && members.exists?(user_id: self.user_id)
       member_params = {
         user_id: self.user_id,
diff --git a/app/models/project_category.rb b/app/models/project_category.rb
index 3a9819816..67b802998 100644
--- a/app/models/project_category.rb
+++ b/app/models/project_category.rb
@@ -8,11 +8,6 @@
 #  projects_count :integer          default("0")
 #  created_at     :datetime         not null
 #  updated_at     :datetime         not null
-#  ancestry       :string(255)
-#
-# Indexes
-#
-#  index_project_categories_on_ancestry  (ancestry)
 #
 
 class ProjectCategory < ApplicationRecord
diff --git a/app/models/repository.rb b/app/models/repository.rb
index b6d2321fc..978bc3c57 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -25,7 +25,6 @@
 #
 # Indexes
 #
-#  index_repositories_on_identifier  (identifier)
 #  index_repositories_on_project_id  (project_id)
 #  index_repositories_on_user_id     (user_id)
 #
diff --git a/app/models/school.rb b/app/models/school.rb
index f3b7ac0ab..5b30be9a5 100644
--- a/app/models/school.rb
+++ b/app/models/school.rb
@@ -1,3 +1,39 @@
+# == Schema Information
+#
+# Table name: schools
+#
+#  id                 :integer          not null, primary key
+#  name               :string(255)
+#  province           :string(255)
+#  created_at         :datetime         not null
+#  updated_at         :datetime         not null
+#  logo_link          :string(255)
+#  pinyin             :string(255)
+#  school_type        :integer          default("0")
+#  city               :string(255)
+#  address            :string(255)
+#  auto_users_trial   :boolean          default("0")
+#  shool_code         :string(255)
+#  authorization_time :datetime
+#  ec_auth            :integer          default("0")
+#  identifier         :string(255)
+#  is_online          :boolean          default("0")
+#  video_name         :string(255)
+#  video_desc         :string(255)
+#  course_link        :string(255)
+#  course_name        :string(255)
+#  partner_id         :integer
+#  customer_id        :integer
+#  school_property_id :integer
+#
+# Indexes
+#
+#  index_schools_on_customer_id         (customer_id)
+#  index_schools_on_identifier          (identifier)
+#  index_schools_on_partner_id          (partner_id)
+#  index_schools_on_school_property_id  (school_property_id)
+#
+
 class School < ApplicationRecord
   has_many :departments, dependent: :destroy
 
diff --git a/app/models/team.rb b/app/models/team.rb
index 82a3e88c1..d17827da8 100644
--- a/app/models/team.rb
+++ b/app/models/team.rb
@@ -14,6 +14,7 @@
 #  gtid                   :integer
 #  created_at             :datetime         not null
 #  updated_at             :datetime         not null
+#  nickname               :string(255)
 #
 # Indexes
 #
diff --git a/app/models/trustie/course.rb b/app/models/trustie/course.rb
index 6cf6411e1..1c951ad68 100644
--- a/app/models/trustie/course.rb
+++ b/app/models/trustie/course.rb
@@ -1,4 +1,87 @@
+# == Schema Information
+#
+# Table name: courses
+#
+#  id                         :integer          not null, primary key
+#  tea_id                     :integer
+#  name                       :string(255)
+#  state                      :integer
+#  code                       :string(255)
+#  time                       :integer
+#  extra                      :string(255)
+#  created_at                 :datetime         not null
+#  updated_at                 :datetime         not null
+#  location                   :string(255)
+#  term                       :string(255)
+#  string                     :string(255)
+#  password                   :string(255)
+#  setup_time                 :string(255)
+#  endup_time                 :string(255)
+#  class_period               :integer          default("0")
+#  school_id                  :integer
+#  description                :text(65535)
+#  status                     :integer          default("1")
+#  attachmenttype             :integer          default("2")
+#  lft                        :integer
+#  rgt                        :integer
+#  is_public                  :integer          default("1")
+#  inherit_members            :integer          default("1")
+#  open_student               :integer          default("0")
+#  outline                    :integer          default("0")
+#  publish_resource           :integer          default("0")
+#  is_delete                  :integer          default("0")
+#  end_time                   :integer
+#  end_term                   :string(255)
+#  is_excellent               :integer          default("0")
+#  excellent_option           :integer          default("0")
+#  is_copy                    :integer          default("0")
+#  visits                     :integer          default("0")
+#  syllabus_id                :integer
+#  invite_code                :string(255)
+#  qrcode                     :string(255)
+#  qrcode_expiretime          :integer          default("0")
+#  invite_code_halt           :integer          default("0")
+#  os_allow                   :integer          default("0")
+#  credit                     :float(24)
+#  is_end                     :boolean          default("0")
+#  end_date                   :date
+#  choose_group_allow         :boolean          default("0")
+#  homepage_show              :boolean          default("0")
+#  course_list_id             :integer
+#  members_count              :integer          default("0")
+#  homework_commons_count     :integer          default("0")
+#  show_unit                  :boolean          default("0")
+#  teacher_list               :string(255)      default("老师")
+#  student_list               :string(255)      default("学生")
+#  is_hidden                  :boolean          default("0")
+#  course_members_count       :integer          default("0")
+#  course_groups_count        :integer          default("0")
+#  authentication             :boolean          default("0")
+#  professional_certification :boolean          default("0")
+#  graduation_topics_count    :integer          default("0")
+#  graduation_tasks_count     :integer          default("0")
+#  polls_count                :integer          default("0")
+#  exercises_count            :integer          default("0")
+#  start_date                 :date
+#  subject_id                 :integer          default("0")
+#  excellent                  :boolean          default("0")
+#  email_notify               :boolean          default("0")
+#  sticky                     :boolean          default("0")
+#  sticky_time                :datetime
+#  laboratory_id              :integer
+#  mooc_course_id             :integer
+#
+# Indexes
+#
+#  index_courses_on_invite_code              (invite_code) UNIQUE
+#  index_courses_on_laboratory_id            (laboratory_id)
+#  index_courses_on_mooc_course_id           (mooc_course_id)
+#  index_courses_on_school_id_and_is_delete  (school_id,is_delete)
+#  index_courses_on_subject_id               (subject_id)
+#  index_courses_on_tea_id                   (tea_id)
+#
+
 class Trustie::Course < Trustie::Database
   has_many :course_groups, class_name: "Trustie::CourseGroup"
   has_many :homework_commons, class_name: "Trustie::HomeworkCommon"
-end
\ No newline at end of file
+end
diff --git a/app/models/trustie/course_group.rb b/app/models/trustie/course_group.rb
index d9fee73b3..539ddaa11 100644
--- a/app/models/trustie/course_group.rb
+++ b/app/models/trustie/course_group.rb
@@ -1,3 +1,25 @@
+# == Schema Information
+#
+# Table name: course_groups
+#
+#  id                   :integer          not null, primary key
+#  name                 :string(255)
+#  course_id            :integer
+#  created_at           :datetime         not null
+#  updated_at           :datetime         not null
+#  members_count        :integer
+#  invite_code          :string(255)
+#  position             :integer          default("0")
+#  course_members_count :integer          default("0")
+#  invite_code_halt     :boolean          default("0")
+#  invite_code_set      :integer          default("0")
+#
+# Indexes
+#
+#  index_course_groups_on_course_id    (course_id)
+#  index_course_groups_on_invite_code  (invite_code) UNIQUE
+#
+
 class Trustie::CourseGroup < Trustie::Database
   belongs_to :course, class_name: "Trustie::Course"
-end
\ No newline at end of file
+end
diff --git a/app/models/trustie/homework_common.rb b/app/models/trustie/homework_common.rb
index 70dd31e6a..32af834ef 100644
--- a/app/models/trustie/homework_common.rb
+++ b/app/models/trustie/homework_common.rb
@@ -1,3 +1,54 @@
+# == Schema Information
+#
+# Table name: homework_commons
+#
+#  id                          :integer          not null, primary key
+#  name                        :string(255)
+#  user_id                     :integer
+#  description                 :text(65535)
+#  publish_time                :datetime
+#  end_time                    :datetime
+#  homework_type               :integer          default("1")
+#  late_penalty                :string(255)      default("0")
+#  course_id                   :integer
+#  created_at                  :datetime         not null
+#  updated_at                  :datetime         not null
+#  teacher_priority            :integer          default("1")
+#  anonymous_comment           :boolean          default("0")
+#  quotes                      :integer          default("0")
+#  is_open                     :integer          default("0")
+#  simi_time                   :datetime
+#  score_open                  :boolean          default("0")
+#  anonymous_appeal            :boolean          default("0")
+#  homework_bank_id            :integer
+#  is_update                   :boolean          default("0")
+#  is_public                   :boolean          default("0")
+#  reference_answer            :text(65535)
+#  answer_public               :boolean          default("0")
+#  archive_time                :datetime
+#  allow_late                  :boolean          default("0")
+#  late_time                   :datetime
+#  work_public                 :boolean          default("0")
+#  explanation                 :text(65535)
+#  unified_setting             :boolean          default("1")
+#  comment_public              :boolean          default("1")
+#  course_homework_category_id :integer
+#  work_efficiency             :boolean          default("0")
+#  eff_score                   :float(24)        default("0")
+#  max_efficiency              :float(24)        default("0")
+#  course_second_category_id   :integer          default("0")
+#  calculation_time            :datetime
+#  position                    :integer          default("0")
+#  total_score                 :float(24)        default("100")
+#  category_position           :integer          default("0")
+#
+# Indexes
+#
+#  index_homework_commons_on_course_id_and_id           (course_id,id)
+#  index_homework_commons_on_course_second_category_id  (course_second_category_id)
+#  index_homework_commons_on_homework_bank_id           (homework_bank_id)
+#
+
 class Trustie::HomeworkCommon < Trustie::Database
   belongs_to :course, class_name: "Trustie::Course"
-end
\ No newline at end of file
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index c0dcedf50..26b61000c 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -39,13 +39,14 @@
 #  business                   :boolean          default("0")
 #  profile_completed          :boolean          default("0")
 #  laboratory_id              :integer
-#  platform                   :string(255)      default("0")
-#  gitea_token                :string(255)
-#  gitea_uid                  :integer
 #  is_shixun_marker           :boolean          default("0")
+#  admin_visitable            :boolean          default("0")
+#  collaborator               :boolean          default("0")
+#  gitea_uid                  :integer
 #  is_sync_pwd                :boolean          default("1")
 #  watchers_count             :integer          default("0")
 #  devops_step                :integer          default("0")
+#  gitea_token                :string(255)
 #
 # Indexes
 #
@@ -53,8 +54,9 @@
 #  index_users_on_homepage_engineer  (homepage_engineer)
 #  index_users_on_homepage_teacher   (homepage_teacher)
 #  index_users_on_laboratory_id      (laboratory_id)
-#  index_users_on_login              (login)
-#  index_users_on_mail               (mail)
+#  index_users_on_login              (login) UNIQUE
+#  index_users_on_mail               (mail) UNIQUE
+#  index_users_on_phone              (phone) UNIQUE
 #  index_users_on_type               (type)
 #
 
@@ -66,6 +68,7 @@ class User < Owner
   include Likeable
   include BaseModel
   include Droneable
+  include User::Avatar
   # include Searchable::Dependents::User
 
   # devops step
@@ -190,6 +193,10 @@ class User < Owner
   validate :validate_sensitive_string
   validate :validate_password_length
 
+  def name
+    login
+  end
+  
   # 删除自动登录的token，一旦退出下次会提示需要登录
   def delete_autologin_token(value)
     Token.where(:user_id => id, :action => 'autologin', :value => value).delete_all
diff --git a/app/models/user/avatar.rb b/app/models/user/avatar.rb
new file mode 100644
index 000000000..7a1a174c3
--- /dev/null
+++ b/app/models/user/avatar.rb
@@ -0,0 +1,37 @@
+require 'letter_avatar/has_avatar'
+require 'chinese_pinyin'
+
+class User
+  module Avatar
+    extend ActiveSupport::Concern
+    include LetterAvatar::HasAvatar
+
+    def username
+      self.lastname.blank? ? self.login :  Pinyin.t(self.lastname)
+    end
+
+    def get_letter_avatar_url(size = :lg)
+      avatar_path(size).split('public/')&.last
+    end
+
+    def avatar_path(size)
+      LetterAvatar.generate self.username, avatar_size(size)
+    end
+    
+    # 返回头像尺寸
+    # xs: 22px
+    # sm: 32px
+    # md: 48px
+    # lg: 120px
+    def avatar_size(size)
+      case size
+      when :xs then 22
+      when :sm then 32
+      when :md then 48
+      when :lg then 120
+      else size
+      end
+    end
+
+  end
+end
diff --git a/app/models/user_action.rb b/app/models/user_action.rb
index 3ad8010ea..179359695 100644
--- a/app/models/user_action.rb
+++ b/app/models/user_action.rb
@@ -12,7 +12,9 @@
 #
 # Indexes
 #
-#  index_user_actions_on_ip  (ip)
+#  index_user_actions_on_ip                       (ip)
+#  index_user_actions_on_user_id                  (user_id)
+#  index_user_actions_on_user_id_and_action_type  (user_id,action_type)
 #
 
 class UserAction < ApplicationRecord
diff --git a/app/models/user_agent.rb b/app/models/user_agent.rb
index 49d7b35a1..ba519d6fb 100644
--- a/app/models/user_agent.rb
+++ b/app/models/user_agent.rb
@@ -10,10 +10,13 @@
 #  updated_at      :datetime         not null
 #  register_status :integer          default("0")
 #  action_status   :integer          default("0")
+#  is_delete       :boolean          default("0")
+#  user_id         :integer
 #
 # Indexes
 #
-#  index_user_agents_on_ip  (ip) UNIQUE
+#  index_user_agents_on_ip       (ip)
+#  index_user_agents_on_user_id  (user_id)
 #
 
 class UserAgent < ApplicationRecord
diff --git a/app/models/user_extension.rb b/app/models/user_extension.rb
index 20e2b5c4f..4afd89bd5 100644
--- a/app/models/user_extension.rb
+++ b/app/models/user_extension.rb
@@ -22,6 +22,9 @@
 #  school_id          :integer
 #  description        :string(255)      default("")
 #  department_id      :integer
+#  honor              :text(65535)
+#  edu_background     :integer
+#  edu_entry_year     :integer
 #
 # Indexes
 #
diff --git a/app/services/organizations/teams/update_service.rb b/app/services/organizations/teams/update_service.rb
index 71c82c40b..b5b273d8a 100644
--- a/app/services/organizations/teams/update_service.rb
+++ b/app/services/organizations/teams/update_service.rb
@@ -27,7 +27,7 @@ class Organizations::Teams::UpdateService < ApplicationService
     if team.authorize == "owner"
       update_params = params.slice(:description)
     else
-      update_params = params.slice(:name, :description, :authorize, :includes_all_project, :can_create_org_project)
+      update_params = params.slice(:name, :nickname, :description, :authorize, :includes_all_project, :can_create_org_project)
     end
     update_params
   end
diff --git a/app/views/organizations/organizations/_detail.json.jbuilder b/app/views/organizations/organizations/_detail.json.jbuilder
index 64feadca1..4a8b512b9 100644
--- a/app/views/organizations/organizations/_detail.json.jbuilder
+++ b/app/views/organizations/organizations/_detail.json.jbuilder
@@ -1,6 +1,6 @@
 json.id organization.id
 json.name organization.login
-json.nickname organization.nickname
+json.nickname organization.nickname.blank? ? organization.name : organization.nickname
 json.description organization.description
 json.website organization.website
 json.location organization.location
diff --git a/app/views/organizations/teams/_detail.json.jbuilder b/app/views/organizations/teams/_detail.json.jbuilder
index 4f3588cb9..68572814f 100644
--- a/app/views/organizations/teams/_detail.json.jbuilder
+++ b/app/views/organizations/teams/_detail.json.jbuilder
@@ -1,5 +1,6 @@
 json.id team.id
 json.name team.name
+json.nickname team.nickname.blank? ? team.name : team.nickname
 json.description team.description
 json.authorize team.authorize
 json.includes_all_project team.includes_all_project
diff --git a/app/views/projects/_project_detail.json.jbuilder b/app/views/projects/_project_detail.json.jbuilder
index 94aee427e..d0b62aaa3 100644
--- a/app/views/projects/_project_detail.json.jbuilder
+++ b/app/views/projects/_project_detail.json.jbuilder
@@ -26,7 +26,7 @@ json.author do
     json.name user.try(:show_real_name)
     json.type user&.type
     json.login user.login
-    json.image_url render_avatar_url(user)
+    json.image_url url_to_avatar(user)
   end
 end
 
diff --git a/app/views/projects/index.json.jbuilder b/app/views/projects/index.json.jbuilder
index 0e23ac03d..96ab89c00 100644
--- a/app/views/projects/index.json.jbuilder
+++ b/app/views/projects/index.json.jbuilder
@@ -28,7 +28,7 @@ json.projects @projects do |project|
       json.type user.type
       json.name user.try(:show_real_name)
       json.login user.login
-      json.image_url render_avatar_url(user)
+      json.image_url url_to_avatar(user)
     end
   end
 
diff --git a/config/initializers/letter_avatar.rb b/config/initializers/letter_avatar.rb
new file mode 100644
index 000000000..d3b0ec098
--- /dev/null
+++ b/config/initializers/letter_avatar.rb
@@ -0,0 +1,9 @@
+LetterAvatar.setup do |config|
+  config.fill_color        = 'rgba(255, 255, 255, 1)' # default is 'rgba(255, 255, 255, 0.65)'
+  config.cache_base_path   = 'public/system/lets'     # default is 'public/system'
+  config.colors_palette    = :iwanthue                # default is :google
+  # config.weight            = 500                      # default is 300
+  config.annotate_position = '-0+10'                  # default is -0+5
+  # config.letters_count     = 2                        # default is 1
+  config.pointsize         = 300
+end
diff --git a/db/migrate/20210419023310_add_nickname_to_teams.rb b/db/migrate/20210419023310_add_nickname_to_teams.rb
new file mode 100644
index 000000000..ed80f1935
--- /dev/null
+++ b/db/migrate/20210419023310_add_nickname_to_teams.rb
@@ -0,0 +1,5 @@
+class AddNicknameToTeams < ActiveRecord::Migration[5.2]
+  def change
+    add_column :teams, :nickname, :string
+  end
+end