diff --git a/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb b/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb
index 65d172fa..8d5d9ecb 100644
--- a/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb
+++ b/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb
@@ -38,8 +38,8 @@ module Panel::Announcement::BackEnd::BulletinsHelper
 
   def file_picture_preview_setting(file_path)
     res= ""
-    ext = File.extname(file_path)[1..-1]
-    puts ext
+    #ext = File.extname(file_path)
+    ext = MIME::Types.type_for(file_path).first.to_s.split("/")[1]
     unless file_path.nil?
       case ext
         when "jpg","jpeg","png","gif"