diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index a6464a151..e5582ab87 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -1116,6 +1116,7 @@ class ExercisesController < ApplicationController
 
   # 学生提交试卷
   def commit_exercise
+    tip_exception(-1, "试卷已提交") if @answer_committed_user.commit_status == 1
     ActiveRecord::Base.transaction do
       begin
         can_commit_exercise = false