diff --git a/app/controllers/api/v1/projects/branches_controller.rb b/app/controllers/api/v1/projects/branches_controller.rb
index 33346573c..f16aa8373 100644
--- a/app/controllers/api/v1/projects/branches_controller.rb
+++ b/app/controllers/api/v1/projects/branches_controller.rb
@@ -15,6 +15,17 @@ class Api::V1::Projects::BranchesController < Api::V1::BaseController
     @result_object = Api::V1::Projects::Branches::CreateService.call(@project, branch_params, current_user&.gitea_token)
   end
 
+  before_action :require_manager_above, only: [:update_default_branch] 
+
+  def update_default_branch 
+    @result_object = Api::V1::Projects::Branches::UpdateDefaultBranchService.call(@project, params[:default_branch], current_user&.gitea_token)
+    if @result_object
+      return render_ok 
+    else
+      return render_error('更新默认分支失败!') 
+    end
+  end
+
   private 
   def branch_params 
     params.require(:branch).permit(:new_branch_name, :old_branch_name)
diff --git a/app/services/api/v1/projects/branches/create_service.rb b/app/services/api/v1/projects/branches/create_service.rb
index 2837dfcf4..eae3779f8 100644
--- a/app/services/api/v1/projects/branches/create_service.rb
+++ b/app/services/api/v1/projects/branches/create_service.rb
@@ -18,7 +18,7 @@ class Api::V1::Projects::Branches::CreateService < ApplicationService
   def call 
     raise Error, errors.full_messages.join(",") unless valid?
 
-    check_new_branch_exist
+    check_branch_exist
     excute_data_to_gitea
     
     gitea_data
@@ -43,9 +43,10 @@ class Api::V1::Projects::Branches::CreateService < ApplicationService
     raise Error, '创建分支失败！' unless @gitea_data.is_a?(Hash)
   end
 
-  def check_new_branch_exist
+  def check_branch_exist
     result = $gitea_client.get_repos_branch_name_set_by_owner_repo(owner, repo, {query: request_params}) rescue nil
     raise Error, '查询分支名称失败！' unless result.is_a?(Hash)
-    raise Error, '分支已存在！' if result['branch_name'].include?(@new_branch_name)
+    raise Error, '旧分支不存在！' if !result['branch_name'].include?(@old_branch_name)
+    raise Error, '新分支已存在！' if result['branch_name'].include?(@new_branch_name)
   end
 end
\ No newline at end of file
diff --git a/app/services/api/v1/projects/branches/update_default_branch_service.rb b/app/services/api/v1/projects/branches/update_default_branch_service.rb
new file mode 100644
index 000000000..5c220aa5d
--- /dev/null
+++ b/app/services/api/v1/projects/branches/update_default_branch_service.rb
@@ -0,0 +1,55 @@
+class Api::V1::Projects::Branches::UpdateDefaultBranchService < ApplicationService 
+  include ActiveModel::Model
+
+  attr_accessor :project, :token, :owner, :repo, :new_default_branch
+  attr_accessor :gitea_data
+
+  validates :new_default_branch, presence: true
+
+  def initialize(project, new_default_branch, token=nil)
+    @project = project 
+    @owner = project&.owner.login 
+    @repo = project&.identifier
+    @new_default_branch = new_default_branch
+    @token = token 
+  end
+
+  def call 
+    raise Error, errors.full_messages.join(",") unless valid?
+
+    check_branch_exist
+    update_project
+    excute_data_to_gitea
+    
+    gitea_data
+  end
+
+  private 
+  def request_params 
+    {
+      access_token: token 
+    }
+  end
+
+  def request_body 
+    {
+      default_branch: new_default_branch
+    }
+  end
+
+  def update_project 
+    @project.attributes = request_body
+    raise Error, '更新默认分支失败！' unless @project.save
+  end
+
+  def excute_data_to_gitea 
+    @gitea_data = $gitea_client.patch_repos_by_owner_repo(owner, repo, {body: request_body.to_json, query: request_params}) rescue nil
+    raise Error, '更新默认分支失败！' unless @gitea_data.is_a?(Hash)
+  end
+
+  def check_branch_exist
+    result = $gitea_client.get_repos_branch_name_set_by_owner_repo(owner, repo, {query: request_params}) rescue nil
+    raise Error, '查询分支名称失败！' unless result.is_a?(Hash)
+    raise Error, '新默认分支不存在！' if !result['branch_name'].include?(@new_default_branch)
+  end
+end
\ No newline at end of file
diff --git a/config/routes/api.rb b/config/routes/api.rb
index 19531526e..92f18e2d7 100644
--- a/config/routes/api.rb
+++ b/config/routes/api.rb
@@ -48,7 +48,8 @@ defaults format: :json do
             end
             resources :branches, only:[:index, :create] do 
               collection do 
-                get :all 
+                get :all
+                patch :update_default_branch
               end
             end
             resources :commits, only: [:index]