diff --git a/app/controllers/graduation_tasks_controller.rb b/app/controllers/graduation_tasks_controller.rb
index a1f1d01c4..2e72c57d3 100644
--- a/app/controllers/graduation_tasks_controller.rb
+++ b/app/controllers/graduation_tasks_controller.rb
@@ -109,8 +109,8 @@ class GraduationTasksController < ApplicationController
       end
 
       # 排序
-      rorder = params[:order] || "updated_at"
-      b_order = params[:b_order] || "desc"
+      rorder = params[:order].blank? ? "updated_at" : params[:order]
+      b_order = params[:b_order].blank? ? "desc" : params[:b_order]
       if rorder == "created_at" || rorder == "work_score"
         @work_list = @work_list.order("graduation_works.#{rorder} #{b_order}")
       elsif rorder == "student_id"