diff --git a/WebRoot/WEB-INF/jsp/sunvote/homework/homework_list.jsp b/WebRoot/WEB-INF/jsp/sunvote/homework/homework_list.jsp
index b40d50e..ce5d81c 100644
--- a/WebRoot/WEB-INF/jsp/sunvote/homework/homework_list.jsp
+++ b/WebRoot/WEB-INF/jsp/sunvote/homework/homework_list.jsp
@@ -68,7 +68,7 @@
 						<th>题目数</th>
 						<th>完成情况</th>
 						<th>总分</th>
-						<th>操作</th>
+						<th style="text-align:center">操作</th>
 					</tr>
 				</thead>
 			</table>
diff --git a/WebRoot/WEB-INF/jsp/sunvote/homework/homework_report.jsp b/WebRoot/WEB-INF/jsp/sunvote/homework/homework_report.jsp
index 6737808..c82e166 100644
--- a/WebRoot/WEB-INF/jsp/sunvote/homework/homework_report.jsp
+++ b/WebRoot/WEB-INF/jsp/sunvote/homework/homework_report.jsp
@@ -295,11 +295,14 @@
 							 stundent_num[j]=res.DATA[j].length;
 						 }
 						 max_num=Math.max.apply(null,stundent_num);
+						 if(max_num==0){
+							 _html='<div style="height:200px;"></div>';
+						 }
 						 for(i=0;i<res.DATA.length;i++){
 							 if(res.ANSWER.indexOf(String.fromCharCode(65+i))>-1){
-								 _html += '<div class="ans_list" style="height:'+(stundent_num[i]*200/max_num).toFixed(2)+'px;"><div class="rel ans_correct"><p class="p_num">'+res.DATA[i].length+'人</p></div><p class="ans_option">'+String.fromCharCode(65+i)+'</p></div>'
+								 _html += '<div class="ans_list" style="height:'+(max_num==0?0:(stundent_num[i]*200/max_num).toFixed(2))+'px;"><div class="rel ans_correct"><p class="p_num">'+res.DATA[i].length+'人</p></div><p class="ans_option">'+String.fromCharCode(65+i)+'</p></div>'
 							 }else{
-								 _html += '<div class="ans_list" style="height:'+(stundent_num[i]*200/max_num).toFixed(2)+'px;"><div class="rel ans_error"><p class="p_num">'+res.DATA[i].length+'人</p></div><p class="ans_option">'+String.fromCharCode(65+i)+'</p></div>';
+								 _html += '<div class="ans_list" style="height:'+(max_num==0?0:(stundent_num[i]*200/max_num).toFixed(2))+'px;"><div class="rel ans_error"><p class="p_num">'+res.DATA[i].length+'人</p></div><p class="ans_option">'+String.fromCharCode(65+i)+'</p></div>';
 							 }
 						 }
 						 var student_option_list='';