diff --git a/app/controllers/trustie_hacks_controller.rb b/app/controllers/trustie_hacks_controller.rb
index d66f5a215..7e76e3f4c 100644
--- a/app/controllers/trustie_hacks_controller.rb
+++ b/app/controllers/trustie_hacks_controller.rb
@@ -36,6 +36,15 @@ class TrustieHacksController < ApplicationController
     render_ok
   end
 
+  def entry
+    if @hack.hack_users.exists?(user_id: current_user)
+      render_error('已经报名，请勿重复操作')
+    else
+      @hack.hack_users.create(user_id: current_user)
+      render_ok
+    end
+  end
+
 
   private
 
diff --git a/app/models/trustie_hack.rb b/app/models/trustie_hack.rb
index 898bf2195..b436007ca 100644
--- a/app/models/trustie_hack.rb
+++ b/app/models/trustie_hack.rb
@@ -1,4 +1,9 @@
 class TrustieHack < ApplicationRecord
   has_many :hack_users, :dependent => :destroy
   belongs_to :trustie_hackathon, counter_cache: true
+
+
+  def entry_info(user_id)
+    hack_users.exists?(user_id: user_id)
+  end
 end
diff --git a/app/views/trustie_hacks/index.json.jbuilder b/app/views/trustie_hacks/index.json.jbuilder
index 05e3fd7c7..0f4d4f060 100644
--- a/app/views/trustie_hacks/index.json.jbuilder
+++ b/app/views/trustie_hacks/index.json.jbuilder
@@ -5,5 +5,6 @@ end
 
 json.hacks @hacks do |hack|
   json.(hack, :id, :name, :description, :hack_users_count)
+  json.entry_info hack.entry_info(current_user.id)
 end
 
diff --git a/config/routes.rb b/config/routes.rb
index c0231a701..b2a7b1de6 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -880,7 +880,9 @@ Rails.application.routes.draw do
         get :edit_hackathon
         post :update_hackathon
       end
-
+      member do
+        post :entry
+      end
     end
   end
 
diff --git a/db/migrate/20191106061342_add_uniq_index_for_hack_users.rb b/db/migrate/20191106061342_add_uniq_index_for_hack_users.rb
new file mode 100644
index 000000000..6d1924d92
--- /dev/null
+++ b/db/migrate/20191106061342_add_uniq_index_for_hack_users.rb
@@ -0,0 +1,5 @@
+class AddUniqIndexForHackUsers < ActiveRecord::Migration[5.2]
+  def change
+    add_index :hack_users, [:user_id, :trustie_hack_id], unique: true
+  end
+end