diff --git a/app/controllers/admin/import_controller.rb b/app/controllers/admin/import_controller.rb
index 2f963d8..e427eca 100644
--- a/app/controllers/admin/import_controller.rb
+++ b/app/controllers/admin/import_controller.rb
@@ -72,7 +72,7 @@ class Admin::ImportController < OrbitAdminController
         categories[id]['id'] = old_cate.id.to_s
       end
     end
-    render :json=>categories
+    render :json=>categories.to_json
   end
 
   def module_data_list
@@ -82,7 +82,7 @@ class Admin::ImportController < OrbitAdminController
     response = http.request(request)
     data = response.body
     data = JSON.parse(data)
-    render :json=>data
+    render :json=>data.to_json
   end
 
   def module_data
@@ -99,7 +99,7 @@ class Admin::ImportController < OrbitAdminController
     when 'announcement'
       import_announcement(data)
     end
-    render :json=>['status'=>'ok']
+    render :json=>['status'=>'ok'].to_json
   end
 
   def import_archive(file)