diff --git a/app/views/exercise/_exercise_student.html.erb b/app/views/exercise/_exercise_student.html.erb
index e157ea155..02db5e766 100644
--- a/app/views/exercise/_exercise_student.html.erb
+++ b/app/views/exercise/_exercise_student.html.erb
@@ -218,8 +218,12 @@
       <% end %>
     </div>
     <div class="ur_buttons">
-      <%= link_to "保存",commit_exercise_exercise_path(exercise,:save => 1),:id=>"exercise_submit_btn", :method => :post,:class => "ur_button_submit",:format => 'js',:remote=>true %>
-      <%= link_to "提交",commit_exercise_exercise_path(exercise), :data => {:confirm => "您确定要提交吗？"},:id=>"exercise_submit_btn", :method => :post,:class => "ur_button_submit",:style => "margin-left:20px;",:format => 'js',:remote=>true %>
+      <% if exercise.time == -1 %>
+          <%= link_to "保存",commit_exercise_exercise_path(exercise,:save => 1),:id=>"exercise_submit_btn", :method => :post,:class => "ur_button_submit",:format => 'js',:remote=>true %>
+          <%= link_to "提交",commit_exercise_exercise_path(exercise), :data => {:confirm => "您确定要提交吗？"},:id=>"exercise_submit_btn", :method => :post,:class => "ur_button_submit",:style => "margin-left:20px;",:format => 'js',:remote=>true %>
+      <% else %>
+          <%= link_to "提交",commit_exercise_exercise_path(exercise), :data => {:confirm => "您确定要提交吗？"},:id=>"exercise_submit_btn", :method => :post,:class => "ur_button_submit",:style => "margin-left:84px;",:format => 'js',:remote=>true %>
+      <% end %>
     </div>
     <div class="cl"></div>
     <!--contentbox end-->