diff --git a/public/react/src/common/components/markdown/MarkdownToHtml.js b/public/react/src/common/components/markdown/MarkdownToHtml.js
index c7d15cf64..63733165e 100644
--- a/public/react/src/common/components/markdown/MarkdownToHtml.js
+++ b/public/react/src/common/components/markdown/MarkdownToHtml.js
@@ -3,7 +3,6 @@ import { markdownToHTML } from 'educoder'
 import './MarkdownToHtml.css'
 /** 
   selector 需要传入唯一的selector作为id，不然会引起冲突
-  delay 如果有公式，需要传入delay={true}
 */ 
 class MarkdownToHtml extends Component{
   constructor(props){
@@ -11,17 +10,8 @@ class MarkdownToHtml extends Component{
     this.state={
     }
   }
-  _markdownToHTML = (content, selector) => {
-    if (this.props.delay == true) {
-      (function(content, selector) {
-        // console.log('selector: ', selector)
-          // setTimeout(() => {
-              markdownToHTML(content, selector)
-          // }, 600)
-      })(content, selector)
-    } else {
-      markdownToHTML(content, selector)
-    }
+  _markdownToHTML = (content, selector) => {    
+    markdownToHTML(content, selector)    
   }
   componentDidUpdate = (prevProps) => {
     if (this.props.content) {
diff --git a/public/react/src/modules/courses/exercise/ExerciseReviewAndAnswer.js b/public/react/src/modules/courses/exercise/ExerciseReviewAndAnswer.js
index cd3355082..778829d72 100644
--- a/public/react/src/modules/courses/exercise/ExerciseReviewAndAnswer.js
+++ b/public/react/src/modules/courses/exercise/ExerciseReviewAndAnswer.js
@@ -7,7 +7,7 @@ import '../poll/pollStyle.css'
 import '../css/Courses.css'
 
 import moment from 'moment'
-import { WordsBtn,markdownToHTML,ActionBtn,getImageUrl } from 'educoder'
+import { WordsBtn,markdownToHTML,ActionBtn,getImageUrl, MarkdownToHtml } from 'educoder'
 import Modals from '../../modals/Modals'
 import CoursesListType from '../coursesPublic/CoursesListType';
 
@@ -537,7 +537,7 @@ class ExerciseReviewAndAnswer extends Component{
           />
         <div className="educontent mt10 mb50">
           <p className="clearfix mb20">
-            <WordsBtn style="grey" className="fl" to={current_user.first_category_url}>{courseName}</WordsBtn>
+            <WordsBtn style="grey" className="fl" to={current_user && current_user.first_category_url}>{courseName}</WordsBtn>
             <span className="color-grey-9 fl ml3 mr3">&gt;</span>
             <WordsBtn style="grey" className="fl" to={`/courses/${coursesId}/exercises/${data && data.left_banner_id}`}>{data && data.left_banner_name}</WordsBtn>
             <span className="color-grey-9 fl ml3 mr3">&gt;</span>
@@ -712,7 +712,10 @@ class ExerciseReviewAndAnswer extends Component{
                         </span>
                       </p>
                       <li className="break_word mt15 mb15 pl30 pr30">
-                        <p className="standardAnswer markdown-body" dangerouslySetInnerHTML={{__html: markdownToHTML(item.question_type == 5 ? item.shixun_name : item.question_title).replace(/▁/g,"▁▁▁")}}></p>
+                        {/* <p className="standardAnswer markdown-body" dangerouslySetInnerHTML={{__html: markdownToHTML1(item.question_type == 5 ? item.shixun_name : item.question_title).replace(/▁/g,"▁▁▁")}}></p> */}
+                         <MarkdownToHtml content={(item.question_type == 5 ? item.shixun_name : item.question_title)} selector={'answer_' + key} 
+                             className="standardAnswer"
+                        ></MarkdownToHtml>
                       </li>
                       {
                         // 选择题和判断题共用
@@ -724,6 +727,7 @@ class ExerciseReviewAndAnswer extends Component{
                         questionType={item}
                         user_exercise_status={user_exercise_status}
                         changeQuestionStatus={(No,flag)=>this.changeQuestionStatus(No,flag)}
+                        index={key}
                         ></Single>
                       }
                       {
@@ -736,6 +740,8 @@ class ExerciseReviewAndAnswer extends Component{
                           questionType={item}
                           user_exercise_status={user_exercise_status}
                           changeQuestionStatus={(No,flag)=>this.changeQuestionStatus(No,flag)}
+                          index={key}
+
                           ></Multiple>
                       }
                       {
@@ -748,6 +754,8 @@ class ExerciseReviewAndAnswer extends Component{
                         questionType={item}
                         user_exercise_status={user_exercise_status}
                         changeQuestionStatus={(No,flag)=>this.changeQuestionStatus(No,flag)}
+                        index={key}
+
                         ></FillEmpty>
                       }
                       {
@@ -774,6 +782,8 @@ class ExerciseReviewAndAnswer extends Component{
                         questionType={item}
                         user_exercise_status={user_exercise_status}
                         id={this.state.Id}
+                        index={key}
+
                         ></ShixunAnswer>
                       }
                       
diff --git a/public/react/src/modules/courses/exercise/Exercisestatisticalresult.js b/public/react/src/modules/courses/exercise/Exercisestatisticalresult.js
index 6e7b52715..1771d87b3 100644
--- a/public/react/src/modules/courses/exercise/Exercisestatisticalresult.js
+++ b/public/react/src/modules/courses/exercise/Exercisestatisticalresult.js
@@ -1,5 +1,5 @@
 import React, {Component} from "react";
-import {WordsBtn,markdownToHTML} from 'educoder';
+import {WordsBtn,markdownToHTML, MarkdownToHtml} from 'educoder';
 import { Form, Select, Input, Button,Checkbox,Upload,Icon,message,Modal, Table, Divider,InputNumber, Tag,DatePicker,Radio,Tooltip,Pagination} from "antd";
 import {Link,Switch,Route,Redirect} from 'react-router-dom';
 import axios from 'axios';
@@ -194,8 +194,10 @@ class Exercisestatisticalresult extends Component {
 										<span className="CACFF">{item.ques_position+"."}{item.ques_type===0?"单选":item.ques_type===1?"多选":item.ques_type===2?"判断":item.ques_type===3?"填空":item.ques_type===4?"主观":item.ques_type===5?"实训":""}题</span>
 										<div>
 											{/*Q{item.ques_position}：*/}
-											<div className={"markdown-body"} dangerouslySetInnerHTML={{__html: markdownToHTML(item.ques_title).replace(/▁/g,"▁▁▁")}}></div>
-
+											{/* <div className={"markdown-body"} dangerouslySetInnerHTML={{__html: markdownToHTML1(item.ques_title).replace(/▁/g,"▁▁▁")}}></div> */}
+											<MarkdownToHtml content={item.ques_title} selector={'ques_title_' + key} 
+												className=""
+											></MarkdownToHtml>
 											{/*<span className="markdown-body" dangerouslySetInnerHTML={createMarkup(item.ques_title)}></span>*/}
 										</div>
 										 </div>
diff --git a/public/react/src/modules/courses/exercise/new/JudgeDisplay.js b/public/react/src/modules/courses/exercise/new/JudgeDisplay.js
index 7beaa50e5..0f8930a8a 100644
--- a/public/react/src/modules/courses/exercise/new/JudgeDisplay.js
+++ b/public/react/src/modules/courses/exercise/new/JudgeDisplay.js
@@ -87,9 +87,12 @@ class JudgeDisplay extends Component{
                     return (
                         <div key={optionIndex} className="fl mr30">
                             <Radio disabled checked={item.standard_boolean}></Radio>
-                            <span>{item.choice_text}</span>
+                            {/* <span>{item.choice_text}</span> */}
+                            <MarkdownToHtml content={item.choice_text} selector={'judge_' + optionIndex} 
+                                className=""
+                            ></MarkdownToHtml>
                             {/* <span style={{ display: 'inline-block'}} className="markdown-body"
-                                    dangerouslySetInnerHTML={{__html: markdownToHTML(item.choice_text)}}></span> */}
+                                    dangerouslySetInnerHTML={{__html: markdownToHTML1(item.choice_text)}}></span> */}
                         </div>)
                   
                 })}
diff --git a/public/react/src/modules/courses/exercise/new/MainDisplay.js b/public/react/src/modules/courses/exercise/new/MainDisplay.js
index 0581865d7..44a795374 100644
--- a/public/react/src/modules/courses/exercise/new/MainDisplay.js
+++ b/public/react/src/modules/courses/exercise/new/MainDisplay.js
@@ -70,10 +70,10 @@ class MainDisplay extends Component{
               <div style={{color: '#05101A'}} className="font-16 mb5 font-bd">参考答案：</div>
               
               <MarkdownToHtml content={standard_answer[0]} selector={'answer_' + qNumber} 
-                  delay={true} className=""
+                  className=""
               ></MarkdownToHtml>
               {/* <div className="mainQuestionDisplay markdown-body" 
-                  dangerouslySetInnerHTML={{__html: markdownToHTML(standard_answer[0])}}
+                  dangerouslySetInnerHTML={{__html: markdownToHTML1(standard_answer[0])}}
               >
               </div> */}
             </React.Fragment>            
diff --git a/public/react/src/modules/courses/exercise/new/NullDisplay.js b/public/react/src/modules/courses/exercise/new/NullDisplay.js
index eade97474..079b1194f 100644
--- a/public/react/src/modules/courses/exercise/new/NullDisplay.js
+++ b/public/react/src/modules/courses/exercise/new/NullDisplay.js
@@ -109,7 +109,7 @@ class NullDisplay extends Component{
                             <div className="answers">
                                 { answers.answer_text.map((item, itemIndex) => {
                                     return <MarkdownToHtml 
-                                        className="answer" key={itemIndex} delay={true}
+                                        className="answer" key={itemIndex}
                                         content={item} selector={'null_' + (index + 1) + '' + (itemIndex + 1)}     
                                     ></MarkdownToHtml>
                                 })}
diff --git a/public/react/src/modules/courses/exercise/new/QestionDisplayHeader.js b/public/react/src/modules/courses/exercise/new/QestionDisplayHeader.js
index 7b82b14b6..c90d87dac 100644
--- a/public/react/src/modules/courses/exercise/new/QestionDisplayHeader.js
+++ b/public/react/src/modules/courses/exercise/new/QestionDisplayHeader.js
@@ -82,9 +82,9 @@ class QestionDisplayHeader extends Component{
         </div>
         { question_title && 
          <MarkdownToHtml content={question_title} selector={'qtitle_' + (index + 1)} style={{ display: 'inline-block', width:'100%' , margin: '10px 0px 15px' }}
-            delay={true}
+            
          ></MarkdownToHtml>
-        //  <div className="markdown-body" dangerouslySetInnerHTML={{__html: markdownToHTML(question_title)}} 
+        //  <div className="markdown-body" dangerouslySetInnerHTML={{__html: markdownToHTML1(question_title)}} 
         // style={{ display: 'inline-block', width:'100%' , margin: '10px 0px 15px' }}></div>
           }
         </React.Fragment>
diff --git a/public/react/src/modules/courses/exercise/new/SingleDisplay.js b/public/react/src/modules/courses/exercise/new/SingleDisplay.js
index cbb6da827..bce4dc4c1 100644
--- a/public/react/src/modules/courses/exercise/new/SingleDisplay.js
+++ b/public/react/src/modules/courses/exercise/new/SingleDisplay.js
@@ -101,10 +101,10 @@ class SingleDisplay extends Component{
                         <div className="mb10 clearfix" key={optionIndex}>
                             <Radio disabled className="fl lineh-20" checked={item.standard_boolean}>{prefix}</Radio>
                             <MarkdownToHtml content={item.choice_text} selector={'single_' + (index + 1) + '' + (optionIndex + 1)} style={{ float: 'left', display: 'inline-block' }}
-                                delay={true}
+                                
                             ></MarkdownToHtml>
                             {/* <span style={{ display: 'inline-block'}} className="markdown-body fl"
-                                    dangerouslySetInnerHTML={{__html:  markdownToHTML(item.choice_text)}}></span> */}
+                                    dangerouslySetInnerHTML={{__html:  markdownToHTML1(item.choice_text)}}></span> */}
                         </div>)
                   } else {
 
@@ -112,10 +112,10 @@ class SingleDisplay extends Component{
                         <div className="mb10 clearfix" key={optionIndex}>
                             <Checkbox  disabled className="fl lineh-20" checked={item.standard_boolean}>{prefix}</Checkbox>
                             <MarkdownToHtml content={item.choice_text} selector={'single_' + (index + 1)+ '' + (optionIndex + 1)} style={{ float: 'left', display: 'inline-block' }}
-                                delay={true}
+                                
                             ></MarkdownToHtml>
                             {/* <span style={{ display: 'inline-block'}} className="markdown-body fl"
-                                    dangerouslySetInnerHTML={{__html:  markdownToHTML(item.choice_text)}}></span> */}
+                                    dangerouslySetInnerHTML={{__html:  markdownToHTML1(item.choice_text)}}></span> */}
                         </div>)
                   }
                 })}
diff --git a/public/react/src/modules/courses/exercise/question/fillEmpty.js b/public/react/src/modules/courses/exercise/question/fillEmpty.js
index 79bc164d8..5179432a2 100644
--- a/public/react/src/modules/courses/exercise/question/fillEmpty.js
+++ b/public/react/src/modules/courses/exercise/question/fillEmpty.js
@@ -1,6 +1,6 @@
 import React,{ Component } from "react";
 import {Checkbox,Radio, Input} from "antd";
-import {DMDEditor,markdownToHTML } from 'educoder'
+import {DMDEditor,markdownToHTML, MarkdownToHtml } from 'educoder'
 
 import axios from 'axios'
 
@@ -140,7 +140,10 @@ class fillEmpty extends Component{
                       {
                         item.answer_text && item.answer_text.map((i,index)=>{
                           return(
-                            <div className="standardAnswer markdown-body answerStyle mb10" dangerouslySetInnerHTML={{__html: markdownToHTML(i)}}></div>
+                            <MarkdownToHtml content={i} selector={'empty_' + (this.props.index + 1) +(k + 1) + (index + 1)}
+                              className="standardAnswer answerStyle mb10"                                
+                            ></MarkdownToHtml>
+                            // <div className="standardAnswer markdown-body answerStyle mb10" dangerouslySetInnerHTML={{__html: markdownToHTML1(i)}}></div>
                           )
                         })
                       }
diff --git a/public/react/src/modules/courses/exercise/question/multiple.js b/public/react/src/modules/courses/exercise/question/multiple.js
index 3ef3d960f..7e96f8550 100644
--- a/public/react/src/modules/courses/exercise/question/multiple.js
+++ b/public/react/src/modules/courses/exercise/question/multiple.js
@@ -1,6 +1,6 @@
 import React,{ Component } from "react";
 import {Checkbox,Radio, Input} from "antd";
-import {markdownToHTML} from 'educoder'
+import {markdownToHTML, MarkdownToHtml} from 'educoder'
 
 import axios from 'axios'
 const tagArray = [
@@ -51,7 +51,10 @@ class Multiple extends Component{
                 <p className="clearfix mb15 df">
                   <Checkbox className="fl lineh-20 " value={item.choice_id}>{prefix}</Checkbox>
                   {/* <span class="fl lineh-20 mt1"></span> */}
-                  <span style={{display:"inline-block"}} className="markdown-body " dangerouslySetInnerHTML={{__html: markdownToHTML(item.choice_text)}}></span>
+                  {/* <span style={{display:"inline-block"}} className="markdown-body " dangerouslySetInnerHTML={{__html: markdownToHTML1(item.choice_text)}}></span> */}
+                  <MarkdownToHtml content={item.choice_text} selector={'multiple_' + (this.props.index + 1) + (key + 1)}
+                    className="" style={{display:"inline-block"}}                              
+                  ></MarkdownToHtml>
                 </p>
               )
             })
diff --git a/public/react/src/modules/courses/exercise/question/simpleAnswer.js b/public/react/src/modules/courses/exercise/question/simpleAnswer.js
index 240f775c2..527044968 100644
--- a/public/react/src/modules/courses/exercise/question/simpleAnswer.js
+++ b/public/react/src/modules/courses/exercise/question/simpleAnswer.js
@@ -1,6 +1,6 @@
 import React,{ Component } from "react";
 import {Checkbox,Radio, Input} from "antd";
-import {markdownToHTML} from 'educoder'
+import {markdownToHTML, MarkdownToHtml} from 'educoder'
 import TPMMDEditor from '../../../../modules/tpm/challengesnew/TPMMDEditor'
 
 import axios from 'axios'
@@ -54,7 +54,10 @@ class simpleAnswer extends Component{
         <li className="with100">
           {
             user_exercise_status == 1 ? 
-            <div className="markdown-body answerStyle" dangerouslySetInnerHTML={{__html: markdownToHTML(questionType.user_answer.length>0 ? questionType.user_answer[0]:"")}}></div>
+            // <div className="markdown-body answerStyle" dangerouslySetInnerHTML={{__html: markdownToHTML1(questionType.user_answer.length>0 ? questionType.user_answer[0]:"")}}></div>
+            <MarkdownToHtml content={questionType.user_answer.length>0 ? questionType.user_answer[0]:""} selector={'simgle_' + (this.props.index + 1)}
+              className="answerStyle"                       
+            ></MarkdownToHtml>
             :
             <div>
               <TPMMDEditor ref={this.mdRef} initValue={questionType.user_answer.length > 0 ? questionType.user_answer[0]:''} mdID={'simpleEditor'+questionType.question_id}  placeholder="请输入你的答案"
@@ -70,7 +73,10 @@ class simpleAnswer extends Component{
               exercise.answer_status == 1 || questionType.a_flag ? 
               <div className="standardAnswer">
                 <p className="mb10 font-16">参考答案：</p>
-                <li className="markdown-body answerStyle" dangerouslySetInnerHTML={{__html: markdownToHTML(questionType.standard_answer && questionType.standard_answer[0])}}></li>
+                {/* <li className="markdown-body answerStyle" dangerouslySetInnerHTML={{__html: markdownToHTML1(questionType.standard_answer && questionType.standard_answer[0])}}></li> */}
+                <MarkdownToHtml content={questionType.standard_answer && questionType.standard_answer[0]} selector={'simgle_standard_' + (this.props.index + 1)}
+                  className="answerStyle"                       
+                ></MarkdownToHtml>
                 <p className="mt15"><a className="color-blue font-16" onClick={()=>this.showAndHide(false)}>隐藏参考答案</a></p>
               </div>
               :
@@ -82,7 +88,10 @@ class simpleAnswer extends Component{
           isStudent && exercise.answer_open==true && exercise.exercise_status == 3 ?
           <div className="bor-top-greyE pt20 mt20 standardAnswer">
             <p>参考答案：</p>
-            <li className="markdown-body answerStyle" dangerouslySetInnerHTML={{__html: markdownToHTML(questionType.standard_answer && questionType.standard_answer[0])}}></li>
+            {/* <li className="markdown-body answerStyle" dangerouslySetInnerHTML={{__html: markdownToHTML1(questionType.standard_answer && questionType.standard_answer[0])}}></li> */}
+            <MarkdownToHtml content={questionType.standard_answer && questionType.standard_answer[0]} selector={'simgle_standard2_' + (this.props.index + 1)}
+              className="answerStyle"                       
+            ></MarkdownToHtml>
           </div>:""
         }
       </div>
diff --git a/public/react/src/modules/courses/exercise/question/single.js b/public/react/src/modules/courses/exercise/question/single.js
index 4ff4bf12b..510c28b48 100644
--- a/public/react/src/modules/courses/exercise/question/single.js
+++ b/public/react/src/modules/courses/exercise/question/single.js
@@ -1,7 +1,7 @@
 import React,{ Component } from "react";
 import {Checkbox,Radio, Input} from "antd";
 
-import {markdownToHTML} from 'educoder'
+import {markdownToHTML, MarkdownToHtml} from 'educoder'
 import axios from 'axios'
 const tagArray = [
   'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
@@ -46,7 +46,10 @@ class single extends Component{
                 <p className={parseInt(questionType.question_type) == 0 ? "clearfix mb15 df" : "fl mr40"}>
                   <Radio className="fl lineh-20" value={item.choice_id}>{prefix}</Radio>
                   {/* <span className="fl lineh-20 mr3 "></span> */}
-                  <span style={{display:"inline-block", 'margin-top': '-1px'}} className="markdown-body fl " dangerouslySetInnerHTML={{__html: markdownToHTML(item.choice_text)}}></span>
+                  {/* <span style={{display:"inline-block", 'margin-top': '-1px'}} className="markdown-body fl " dangerouslySetInnerHTML={{__html: markdownToHTML1(item.choice_text)}}></span> */}
+                  <MarkdownToHtml content={item.choice_text} selector={'single_' + (this.props.index + 1) + (key + 1)}
+                    className="fl" style={{display:"inline-block", 'margin-top': '-1px'}}                      
+                  ></MarkdownToHtml>
                 </p>
               )
             })