diff --git a/public/js/editormd/editormd.min.js b/public/js/editormd/editormd.min.js
old mode 100755
new mode 100644
index 0add3b370..844dd546c
--- a/public/js/editormd/editormd.min.js
+++ b/public/js/editormd/editormd.min.js
@@ -558,20 +558,20 @@
 
                     _this.setToolbar();
 
-                    // editormd.loadScript(loadPath + "marked.min", function () {
-                    // });
+                    // 此处影响公式加载
+                    editormd.loadScript(loadPath + "marked.min", function () {
+                        editormd.$marked = marked;
 
-                    editormd.$marked = marked;
-
-                    if (settings.previewCodeHighlight) {
-                        editormd.loadScript(loadPath + "prettify.min", function () {
+                        if (settings.previewCodeHighlight) {
+                            editormd.loadScript(loadPath + "prettify.min", function () {
+                                loadFlowChartOrSequenceDiagram();
+                            });
+                        }
+                        else {
                             loadFlowChartOrSequenceDiagram();
-                        });
-                    }
-                    else {
-                        loadFlowChartOrSequenceDiagram();
-                    }
+                        }
 
+                    });
 
                 });
 
@@ -831,7 +831,7 @@
                 if (scrollTop === 0) {
                     preview.scrollTop(0);
                 }
-                else if (scrollTop + height >= cmScroll.scrollHeight - 16) {
+                else if (scrollTop + height >= cmScroll.scrollHeight - 30) {
                     preview.scrollTop(preview[0].scrollHeight);
                 }
                 else {
@@ -1434,7 +1434,7 @@
                 var tex = $(this);
                 editormd.$katex.render(tex.text(), tex[0]);
 
-                tex.find(".katex").css("font-size", "1.0em");
+                tex.find(".katex").css("font-size", "1.6em");
             });
 
             return this;
@@ -1471,7 +1471,6 @@
             var preview = $this.preview;
             var codeMirror = $this.codeMirror;
             var codeView = codeMirror.find(".CodeMirror-scroll");
-
             var height = codeView.height();
             var scrollTop = codeView.scrollTop();
             var percent = (scrollTop / codeView[0].scrollHeight);
@@ -1483,11 +1482,11 @@
 
             var tocMenuHeight = preview.find(".editormd-toc-menu").height();
             tocMenuHeight = (!tocMenuHeight) ? 0 : tocMenuHeight;
-
+            
             if (scrollTop === 0) {
                 preview.scrollTop(0);
             }
-            else if (scrollTop + height >= codeView[0].scrollHeight - 16) {
+            else if (scrollTop + height >= codeView[0].scrollHeight - 30) {
                 preview.scrollTop(preview[0].scrollHeight);
             }
             else {
@@ -1595,8 +1594,7 @@
                 codeMirror.find(".CodeMirror-scroll").bind(mouseOrTouch("scroll", "touchmove"), function (event) {
                     var height = $(this).height();
                     var scrollTop = $(this).scrollTop();
-                    var percent = (scrollTop / $(this)[0].scrollHeight);
-
+                    var percent = (scrollTop / ($(this)[0].scrollHeight-100));
                     var tocHeight = 0;
 
                     preview.find(".markdown-toc-list").each(function () {
@@ -1609,7 +1607,7 @@
                     if (scrollTop === 0) {
                         preview.scrollTop(0);
                     }
-                    else if (scrollTop + height >= $(this)[0].scrollHeight - 16) {
+                    else if (scrollTop + height >= $(this)[0].scrollHeight - 30) {
                         preview.scrollTop(preview[0].scrollHeight);
                     }
                     else {
@@ -3319,9 +3317,9 @@
                     text = text.replace(emailReg, function ($1, $2, $3, $4) {
                         return $1.replace(/@/g, "_#_@_#_");
                     });
-
+                    // " + editormd.urls.atLinkBase + "" + $2 + "
                     text = text.replace(atLinkReg, function ($1, $2) {
-                        return "<a href=\"" + editormd.urls.atLinkBase + "" + $2 + "\" title=\"&#64;" + $2 + "\" class=\"at-link\">" + $1 + "</a>";
+                        return "<span title=\"&#64;" + $2 + "\" class=\"at-link\"> " + $1 + " </span>";
                     }).replace(/_#_&#64;_#_/g, "@");
                 }
 
@@ -3810,7 +3808,7 @@
                 div.find("." + editormd.classNames.tex).each(function () {
                     var tex = $(this);
                     katex.render(tex.text(), tex[0]);
-                    tex.find(".katex").css("font-size", "1.0em");
+                    tex.find(".katex").css("font-size", "1.6em");
                 });
             };
 
diff --git a/src/modules/tpm/challengesnew/css/newquestion.css b/src/modules/tpm/challengesnew/css/newquestion.css
index 444ca8d16..5c650e3d0 100644
--- a/src/modules/tpm/challengesnew/css/newquestion.css
+++ b/src/modules/tpm/challengesnew/css/newquestion.css
@@ -4,4 +4,7 @@
 .Permanentban{
     color:#5091FF !important;
     border-color: #5091FF !important;
-}
\ No newline at end of file
+}
+.editormd-menu>li:last-child {
+    float: right;
+}
diff --git a/src/modules/tpm/challengesnew/tpm-md-editor.js b/src/modules/tpm/challengesnew/tpm-md-editor.js
index 6e00285cc..5d147a277 100644
--- a/src/modules/tpm/challengesnew/tpm-md-editor.js
+++ b/src/modules/tpm/challengesnew/tpm-md-editor.js
@@ -1,8 +1,6 @@
 import React, { Fragment, useEffect, useRef, useState } from 'react';
 import { getUploadActionUrl, getUrl } from 'educoder';
 import ResizeObserver from 'resize-observer-polyfill';
-// import myxss from '../../../common/filterXss';
-import xss from 'xss';
 import { getImageUrl } from 'educoder';
 import axios from 'axios';
 import '../../courses/css/Courses.css';
@@ -11,7 +9,7 @@ import 'codemirror/lib/codemirror.css';
 import './css/newquestion.css';
 const $ = window.$
 
-const mdIcons = ["bold", "italic", "|", "list-ul", "list-ol", "|", "code", "code-block", "link", "|", "inline-latex", "latex", '|', "image", "table", '|', "line-break", "watch", "clear","fullscreen"];
+const mdIcons = ["bold", "italic", "del", "|", "list-ul", "list-ol", "|", "code", "code-block", "link", "|", "inline-latex", "latex", '|', "image", "table", '|', "line-break", "watch", "clear","fullscreen"];
 
 const NULL_CH = '▁';
 
@@ -122,7 +120,7 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
   // 请求issues接口获取全部可quote的issue列表
   function getIssueList(keyword){
     axios.get(`/v1/${owner}/${projectsId}/issues`,{params:{
-      only_name:true,keyword,sort_direction:"desc",sort_by:"issues.created_on"
+      only_name:true,keyword,sort_direction:"desc",sort_by:"issues.created_on",limit:500,page:1
     }}).then(result=>{
       if(result){
         !keyword && setIssues(result.data.issues);
@@ -319,7 +317,7 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
       {users && users.map((item,key)=>{
         return(
           <div key={key} className={`at_who ${key===0 && `active`}`} onClick={()=>{selectAtWho(item.username)}} onMouseOver={()=>{onMouseOver(key)}}>
-            {item.image_url && <img src={getImageUrl(`/${item.image_url}`)}></img>}
+            {item.image_url && <img src={getImageUrl(`/${item.image_url}`)} alt=''></img>}
             <span>{item.username}</span>
           </div>
         )
@@ -505,7 +503,6 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
             }
           }
         }
-        // xss()防止恶意代码：如alert等
         onChange && onChange(v);
         if(quoteVisibleRef.current){
           const cur = cm.doc.getCursor();
@@ -764,12 +761,12 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
 
   return (
     <Fragment>
-      {atWhoVisible && atWhoList}
       <div ref={editorEl} className={`df editormd-editing ${className} ${imageExpand && 'editormd-image-click-expand'} `}>
-        {quoteVisible && QuoteDiv }
-        <div className={`edu-back-greyf5 radius4 editormd ${error ? 'error' : ''}`} id={containerId} >
+        <div className={`edu-back-greyf5 radius4 editormd ${error ? 'error' : ''} ${quoteVisible || atWhoVisible ? 'quoteBox' : ''}`} id={containerId} >
+          {quoteVisible && QuoteDiv }
+          {atWhoVisible && atWhoList}
           <textarea style={{ display: 'none' }} id={editorBodyId} name="content"></textarea>
-          <div className="CodeMirror cm-s-defualt"></div>
+          <div className="CodeMirror cm-s-defualt" style={{ display: 'none' }}></div>
         </div>
       </div>
       {showResizeBar ? <a ref={resizeBarEl} className='editor-resize'></a> : null}