diff --git a/app/controllers/api/v1/project_topics_controller.rb b/app/controllers/api/v1/project_topics_controller.rb
index 3a23fde4a..5d353fbf4 100644
--- a/app/controllers/api/v1/project_topics_controller.rb
+++ b/app/controllers/api/v1/project_topics_controller.rb
@@ -24,6 +24,21 @@ class Api::V1::ProjectTopicsController < Api::V1::BaseController
     end
   end
 
+  def destroy 
+    ActiveRecord::Base.transaction do 
+      @project = Project.find_by_id(create_params[:project_id])
+      return render_not_found unless @project.present?
+
+      @project_topic = ProjectTopic.find_by_id(params[:id])
+      @project_topic_ralate = @project_topic.project_topic_ralates.find_by(project_id: @project.id)
+      if @project_topic_ralate.destroy! 
+        render_ok 
+      else 
+        render_error("项目取消关联搜索标签失败.")
+      end
+    end
+  end
+
   private 
   def create_params
     params.permit(:project_id, :name)
diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index 9586c1e91..652e80ec6 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -130,6 +130,7 @@ class ProjectsController < ApplicationController
       # 临时特殊处理修改website、lesson_url操作方法
       if project_params.has_key?("website") 
         if params[:project_topic_names].present? && params[:project_topic_names].is_a?(Array)
+          ProjectTopicRalate.where(project: @project).destroy_all
           params[:project_topic_names].each do |name|
             project_topic = ProjectTopic.find_or_create_by!(name: name.downcase)
             project_topic.project_topic_ralates.find_or_create_by!(project: @project)
diff --git a/config/routes/api.rb b/config/routes/api.rb
index 799783f0d..a1945ab43 100644
--- a/config/routes/api.rb
+++ b/config/routes/api.rb
@@ -20,7 +20,7 @@ defaults format: :json do
 
         scope ':repo' do 
           # projects
-          resource :projects, path: '/', only: [:show, :update, :edit, :destroy] do 
+          resource :projects, path: '/', only: [:show, :update, :edit] do 
             collection do 
               get :compare
               get :blame
@@ -97,7 +97,7 @@ defaults format: :json do
       end
 
       resources :projects, only: [:index]
-      resources :project_topics, only: [:index, :create]
+      resources :project_topics, only: [:index, :create, :destroy]
 
       
     end