diff --git a/app/models/course.rb b/app/models/course.rb
index 4b4313ee1..561a031ae 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -495,7 +495,7 @@ class Course < ActiveRecord::Base
   def generate_qrcode
     ticket = self.qrcode
     if !ticket || ticket.size < 10
-      response = Wechat.api.qrcode_create_scene(invite_code)
+      response = Wechat.api.qrcode_create_scene(invite_code, 2592000)
       logger.debug "response = #{response}"
       self.qrcode = response['ticket']
       save! && reload
diff --git a/db/migrate/20160708091258_renew_qrcode.rb b/db/migrate/20160708091258_renew_qrcode.rb
new file mode 100644
index 000000000..59f92b315
--- /dev/null
+++ b/db/migrate/20160708091258_renew_qrcode.rb
@@ -0,0 +1,8 @@
+class RenewQrcode < ActiveRecord::Migration
+  def up
+    Course.update_all(:qrcode => '')
+  end
+
+  def down
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 619ccb7bb..3a56c6af4 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20160630112733) do
+ActiveRecord::Schema.define(:version => 20160708091258) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -562,9 +562,9 @@ ActiveRecord::Schema.define(:version => 20160630112733) do
     t.integer  "excellent_option",              :default => 0
     t.integer  "is_copy",                       :default => 0
     t.integer  "visits",                        :default => 0
-    t.integer  "syllabus_id"
     t.string   "invite_code"
     t.string   "qrcode"
+    t.integer  "syllabus_id"
   end
 
   add_index "courses", ["invite_code"], :name => "index_courses_on_invite_code", :unique => true