diff --git a/public/react/src/modules/courses/members/studentsList.js b/public/react/src/modules/courses/members/studentsList.js
index 20ab384f1..ffdb9ed59 100644
--- a/public/react/src/modules/courses/members/studentsList.js
+++ b/public/react/src/modules/courses/members/studentsList.js
@@ -751,7 +751,7 @@ class studentsList extends Component{
                   !isStudentPage && !isCourseEnd && isAdmin  && <WordsBtn style="blue" className="mr30" onClick={()=>this.addDir()}>新建分班</WordsBtn> }
 
               { 
-                  !isStudentPage && isStudent && !isParent && course_group_id != 0 && <WordsBtn style="blue" className="mr30" onClick={()=>this.addToDir()}>加入分班</WordsBtn> }
+                  !isStudentPage && isStudent && !isParent && course_group_id != 0 && <WordsBtn style="blue" className="" onClick={()=>this.addToDir()}>加入分班</WordsBtn> }
               <style>{`
                 .drop_down_menu li a {
                     padding: 0px;