diff --git a/packages/ui-default/components/autocomplete/index.js b/packages/ui-default/components/autocomplete/index.js
index 6dc0c1f7f..0fb335cf6 100644
--- a/packages/ui-default/components/autocomplete/index.js
+++ b/packages/ui-default/components/autocomplete/index.js
@@ -114,13 +114,9 @@ export default class AutoComplete extends DOMAttachedObject {
   }
 
   async getItems(val) {
-    if (this.cache[val] !== undefined) {
-      return this.cache[val];
-    }
+    if (this.cache[val] !== undefined) return this.cache[val];
     const data = await this.options.items(val);
-    if (this.options.cache) {
-      this.cache[val] = data;
-    }
+    if (this.options.cache) this.cache[val] = data;
     return data;
   }
 
@@ -148,9 +144,7 @@ export default class AutoComplete extends DOMAttachedObject {
   }
 
   open() {
-    if (this.isOpen) {
-      return;
-    }
+    if (this.isOpen) return;
     this.dropInstance.open();
     this.isOpen = true;
   }
diff --git a/packages/ui-default/components/cmeditor/EditorComponent.jsx b/packages/ui-default/components/cmeditor/EditorComponent.jsx
new file mode 100644
index 000000000..baea7a6c2
--- /dev/null
+++ b/packages/ui-default/components/cmeditor/EditorComponent.jsx
@@ -0,0 +1,38 @@
+import React from 'react';
+import Vditor from 'vditor';
+import { config } from './index';
+
+export default class MarkdownEditor extends React.PureComponent {
+  constructor(props) {
+    super(props);
+    this.ref = React.createRef();
+  }
+
+  async componentDidMount() {
+    await new Promise((resolve) => {
+      this.editor = new Vditor(this.ref.current, {
+        ...config,
+        after: resolve,
+        input(value) { this.props.onChange(value); },
+        cache: { id: Math.random().toString() },
+      });
+    });
+  }
+
+  componentWillUnmount() {
+    this.editor.destory();
+    this.editor.detach();
+  }
+
+  value() {
+    return this.editor.getValue();
+  }
+
+  focus() {
+    return this.editor.focus();
+  }
+
+  render() {
+    return <div ref={this.ref}></div>;
+  }
+}
diff --git a/packages/ui-default/components/cmeditor/cmeditor.styl b/packages/ui-default/components/cmeditor/cmeditor.styl
index 6c00da3f4..d28d5640b 100644
--- a/packages/ui-default/components/cmeditor/cmeditor.styl
+++ b/packages/ui-default/components/cmeditor/cmeditor.styl
@@ -1,91 +1,2 @@
-.simplemde
-  border: 1px solid $editor-border-color
-  margin: 0 0 1rem
-  position: relative
-  height: rem(200px)
-  box-sizing: border-box
-  overflow: hidden
-
-.cm-s-simplemde
-  border: 0
-  min-height: 0
-  height: auto
-  padding: 0
-  position: absolute
-  left: 0
-  top: 40px
-  width: 100%
-  bottom: 0
-  color: inherit
-
-.simplemde-toolbar
-  position: absolute
-  left: 0
-  top: 0
-  width: 100%
-  border-radius: 0
-  border: 0
-  opacity: 0
-  background: $toolbar-bg
-  transform: translateY(-20px)
-  transition: opacity .5s, transform .5s
-  transition-timing-function: ease-out-cubic
-
-  &:hover
-    opacity: 1
-
-.toolbar--visible .simplemde-toolbar
-  opacity: 1
-  transform: translateY(0)
-
-.cm-s-simplemde .CodeMirror-scroll
-  height: 100%
-  min-height: 0
-  font-family: $code-font-family
-  color: $text-1-color
-
-.simplemde-toolbar:before,
-.simplemde-toolbar:after
-  display: none
-
-.simplemde-toolbar
-  padding: rem(5px)
-
-.simplemde-toolbar i.separator
-  border-right: 0
-
-.simplemde-toolbar a
-  color: $toolbar-fore !important
-  border: 0
-  background: none
-  border-radius: 0
-  font-size: rem($font-size-icon)
-  outline: 0
-
-  &:hover
-    background: $toolbar-bg-hover
-    color: $toolbar-fore-hover !important
-    border: 0
-
-  &.active
-    background: $toolbar-bg-selected
-    color: $toolbar-fore-selected !important
-    border: 0
-
-.simplemde-toolbar.disabled-for-preview a:not(.no-disable)
-  background: none
-  opacity: $toolbar-disabled-opacity
-
-.cm-s-simplemde .CodeMirror-code .cm-comment
-  background: none
-
-.simplemde-statusbar
-  display: none
-
-.simplemde-preview
-  background: #FFF
-
-.no-heading .cm-s-simplemde .CodeMirror-code
-  .cm-header-1, .cm-header-2, .cm-header-3, .cm-header-4
-    font-size: 1em
-    line-height: 1.5
+.vditor
+  margin-bottom: rem(10px)
diff --git a/packages/ui-default/components/cmeditor/index.js b/packages/ui-default/components/cmeditor/index.js
index bf6cea053..7f935684a 100644
--- a/packages/ui-default/components/cmeditor/index.js
+++ b/packages/ui-default/components/cmeditor/index.js
@@ -1,65 +1,83 @@
 import _ from 'lodash';
 import DOMAttachedObject from 'vj/components/DOMAttachedObject';
 
+export const config = {
+  toolbar: [
+    'emoji', 'headings', 'bold', 'italic', 'strike', 'link', '|',
+    'list', 'ordered-list', 'check', 'outdent', 'indent', '|',
+    'quote', 'line', 'code', 'inline-code', '|',
+    'upload', 'record', 'table', '|',
+    'edit-mode', 'content-theme', 'code-theme', 'export', 'preview',
+  ],
+  mode: 'ir',
+  toolbarConfig: {
+    pin: true,
+  },
+  counter: {
+    enable: true,
+    max: 65536,
+  },
+};
+
 export default class CmEditor extends DOMAttachedObject {
   static DOMAttachKey = 'vjCmEditorInstance';
 
   constructor($dom, options = {}) {
     super($dom);
-    this.editor = null;
     this.options = options;
     this.init();
   }
 
   async init() {
-    const { default: VjCmEditor } = await import('./vjcmeditor');
-
-    const hasFocus = this.$dom.is(':focus');
-    const srcHeight = this.$dom.outerHeight();
-
-    this.editor = new VjCmEditor({
-      ...this.options,
-      element: this.$dom.get(0),
+    const { default: Vditor } = await import('vditor');
+    const { $dom } = this;
+    const hasFocus = $dom.is(':focus');
+    const origin = $dom.get(0);
+    const ele = document.createElement('div');
+    const value = $dom.text();
+    await new Promise((resolve) => {
+      this.editor = new Vditor(ele, {
+        ...config,
+        after: resolve,
+        input(v) { $dom.text(v); },
+        value,
+        cache: { id: Math.random().toString() },
+        upload: {
+          accept: 'image/*,.mp3, .wav, .zip',
+          url: '/api/upload/editor',
+          linkToImgUrl: '/api/upload/fetch',
+          filename(name) {
+            return name.replace(/[^(a-zA-Z0-9\u4e00-\u9fa5.)]/g, '')
+              .replace(/[?\\/:|<>*[\]()$%{}@~]/g, '')
+              .replace('/\\s/g', '');
+          },
+        },
+      });
     });
-    this.moveToEnd();
-
-    const $editor = $(this.editor.wrapper);
-    $editor.css('height', srcHeight);
-    $editor.addClass('toolbar--visible');
-
-    if (hasFocus) {
-      this.focus();
-    }
-  }
-
-  isValid() {
-    return (this.editor !== null);
+    $(ele).addClass('textbox');
+    $dom.hide();
+    origin.parentElement.appendChild(ele);
+    if (hasFocus) this.focus();
+    this.isValid = true;
   }
 
   ensureValid() {
-    if (!this.isValid()) {
-      throw new Error('VjCmEditor is not loaded');
-    }
+    if (!this.isValid) throw new Error('Editor is not loaded');
   }
 
   value(...argv) {
     this.ensureValid();
     const ret = this.editor.value(...argv);
-    if (argv.length > 0) {
-      this.moveToEnd();
-    }
     return ret;
   }
 
+  destory() {
+    this.editor.destory();
+  }
+
   focus() {
     this.ensureValid();
-    this.editor.codemirror.focus();
-  }
-
-  moveToEnd() {
-    this.ensureValid();
-    const cm = this.editor.codemirror;
-    cm.setCursor(cm.lineCount(), 0);
+    this.editor.focus();
   }
 }
 
diff --git a/packages/ui-default/components/cmeditor/vjcmeditor.js b/packages/ui-default/components/cmeditor/vjcmeditor.js
deleted file mode 100644
index 008b02650..000000000
--- a/packages/ui-default/components/cmeditor/vjcmeditor.js
+++ /dev/null
@@ -1,120 +0,0 @@
-import _ from 'lodash';
-import SimpleMDE from 'vj-simplemde';
-
-import request from 'vj/utils/request';
-import i18n from 'vj/utils/i18n';
-
-export default class VjCmEditor extends SimpleMDE {
-  constructor(options = {}) {
-    super({
-      autoDownloadFontAwesome: false,
-      spellChecker: false,
-      forceSync: true,
-      toolbar: [
-        {
-          name: 'bold',
-          action: SimpleMDE.toggleBold,
-          className: 'icon icon-bold',
-          title: i18n('Bold'),
-        },
-        {
-          name: 'italic',
-          action: SimpleMDE.toggleItalic,
-          className: 'icon icon-italic',
-          title: i18n('Italic'),
-        },
-        '|',
-        {
-          name: 'quote',
-          action: SimpleMDE.toggleBlockquote,
-          className: 'icon icon-quote',
-          title: i18n('Quote'),
-        },
-        {
-          name: 'unordered-list',
-          action: SimpleMDE.toggleUnorderedList,
-          className: 'icon icon-unordered_list',
-          title: i18n('Unordered List'),
-        },
-        {
-          name: 'ordered-list',
-          action: SimpleMDE.toggleOrderedList,
-          className: 'icon icon-ordered_list',
-          title: i18n('Ordered List'),
-        },
-        '|',
-        {
-          name: 'code',
-          action: () => this.insertCodeBlock(),
-          className: 'icon icon-code',
-          title: i18n('Insert Code'),
-          default: true,
-        },
-        {
-          name: 'link',
-          action: SimpleMDE.drawLink,
-          className: 'icon icon-link',
-          title: i18n('Create Link'),
-          default: true,
-        },
-        {
-          name: 'image',
-          action: SimpleMDE.drawImage,
-          className: 'icon icon-insert--image',
-          title: i18n('Insert Image'),
-          default: true,
-        },
-        '|',
-        {
-          name: 'preview',
-          action: SimpleMDE.togglePreview,
-          preAction: SimpleMDE.preRenderPreview,
-          className: 'icon icon-preview no-disable',
-          title: i18n('Toggle Preview'),
-          default: true,
-        },
-      ],
-      commonmark: {
-        safe: true,
-      },
-      ...options,
-    });
-  }
-
-  async markdown(text) {
-    // FIXME preview wont update after first toggle
-    const data = await request.ajax({
-      url: '/markdown',
-      method: 'post',
-      data: $.param({ text }, true),
-      dataType: 'text',
-    });
-    _.defer(this.preparePreview.bind(this));
-    return data;
-  }
-
-  preparePreview() {
-    const $preview = $(this.wrapper).find('.simplemde-preview');
-    $preview.addClass('typo');
-    $preview.attr('data-emoji-enabled', 'true');
-    $preview.trigger('vjContentNew');
-  }
-
-  insertCodeBlock() {
-    const text = this.codemirror.getSelection();
-    const startPoint = this.codemirror.getCursor('start');
-    const endPoint = this.codemirror.getCursor('end');
-    const leadingLines = (startPoint.line === 0 && startPoint.ch === 0) ? 0 : 2;
-    // eslint-disable-next-line prefer-template
-    const startText = _.repeat('\n', leadingLines) + '```cpp\n';
-    const endText = '\n```\n';
-    this.codemirror.replaceSelection(`${startText}${text}${endText}`);
-    startPoint.line += leadingLines + 1;
-    startPoint.ch = 0;
-    if (startPoint !== endPoint) {
-      endPoint.line += leadingLines + 1;
-    }
-    this.codemirror.setSelection(startPoint, endPoint);
-    this.codemirror.focus();
-  }
-}
diff --git a/packages/ui-default/components/discussion/comments.page.styl b/packages/ui-default/components/discussion/comments.page.styl
index 4cb8106bc..0967e1019 100644
--- a/packages/ui-default/components/discussion/comments.page.styl
+++ b/packages/ui-default/components/discussion/comments.page.styl
@@ -8,11 +8,11 @@ $downvote-color = red
     display: none
 
 .dczcomments__box .textbox
-  height: rem(180px)
+  min-height: rem(180px)
   resize: vertical
 
 .textbox[name="dczcomments__dummy-box"]
-  height: rem(60px)
+  min-height: rem(60px)
   resize: none
   font-size: rem($font-size-title)
   color: $comment-placeholder-color
diff --git a/packages/ui-default/components/form/textbox.page.styl b/packages/ui-default/components/form/textbox.page.styl
index feda6bc00..6ee8822a7 100644
--- a/packages/ui-default/components/form/textbox.page.styl
+++ b/packages/ui-default/components/form/textbox.page.styl
@@ -23,6 +23,9 @@ input.textbox, textarea.textbox
 textarea.textbox
   height: rem(200px)
 
+div.textbox
+  min-height: rem(200px)
+
 .data-table
   input.textbox, textarea.textbox
     margin-bottom: 0
diff --git a/packages/ui-default/components/highlighter/codemirror.page.styl b/packages/ui-default/components/highlighter/codemirror.page.styl
index c18494ba8..8daa5f351 100644
--- a/packages/ui-default/components/highlighter/codemirror.page.styl
+++ b/packages/ui-default/components/highlighter/codemirror.page.styl
@@ -7,6 +7,4 @@ span.cm-special { line-height: 1em; font-weight: bold; color: #0aa; }
 span.cm-variable { color: black; }
 span.cm-meta { color: #2b91af; }
 span.cm-link { color: #3a3; }
-.CodeMirror-activeline-background { background: #e8f2ff; }
-.CodeMirror-matchingbracket { outline:1px solid grey; color:black !important; }
 }
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 5754fce01..9d53522e8 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -34,7 +34,6 @@
     "chalk": "^4.1.0",
     "classnames": "^2.3.1",
     "clipboard": "^2.0.8",
-    "codemirror": "^5.59.4",
     "copy-webpack-plugin": "^6.1.1",
     "css-loader": "^4.2.2",
     "diff-dom": "^4.2.2",
@@ -95,8 +94,8 @@
     "timeago-react": "^3.0.2",
     "timeago.js": "^4.0.2",
     "uuid": "^8.3.2",
+    "vditor": "^3.8.4",
     "vinyl-buffer": "^1.0.1",
-    "vj-simplemde": "0.0.8",
     "wastyle": "^0.0.5",
     "webpack": "^4.44.2",
     "webpack-bundle-analyzer": "^4.4.0",
diff --git a/packages/ui-default/pages/problem_edit.page.js b/packages/ui-default/pages/problem_edit.page.js
index f383a971b..04ad9511e 100644
--- a/packages/ui-default/pages/problem_edit.page.js
+++ b/packages/ui-default/pages/problem_edit.page.js
@@ -57,7 +57,6 @@ function parseCategorySelection() {
   $txt.val().split(',').map((name) => name.trim()).forEach((name) => {
     if (!name) return;
     const [category, subcategory] = findCategory(name);
-    console.log(name, category, subcategory);
     if (!category) tags.push(name);
     else if (!subcategory) {
       categories[category].select = true;
diff --git a/packages/ui-default/theme/98.js b/packages/ui-default/theme/98.js
index cf5363872..f358ccdd0 100644
--- a/packages/ui-default/theme/98.js
+++ b/packages/ui-default/theme/98.js
@@ -1,6 +1,4 @@
 import 'normalize.css/normalize.css';
-import 'codemirror/lib/codemirror.css';
-import 'vj-simplemde/src/css/simplemde.css';
 import 'pickadate/lib/themes/classic.css';
 import 'pickadate/lib/themes/classic.date.css';
 import 'pickadate/lib/themes/classic.time.css';
diff --git a/packages/ui-default/theme/default.js b/packages/ui-default/theme/default.js
index 1a27f0085..7623e0ea9 100644
--- a/packages/ui-default/theme/default.js
+++ b/packages/ui-default/theme/default.js
@@ -1,6 +1,5 @@
 import 'normalize.css/normalize.css';
-import 'codemirror/lib/codemirror.css';
-import 'vj-simplemde/src/css/simplemde.css';
+import 'vditor/dist/index.css';
 import 'pickadate/lib/themes/classic.css';
 import 'pickadate/lib/themes/classic.date.css';
 import 'pickadate/lib/themes/classic.time.css';
diff --git a/packages/ui-default/utils/cloneAttributes.js b/packages/ui-default/utils/cloneAttributes.js
new file mode 100644
index 000000000..2748600d4
--- /dev/null
+++ b/packages/ui-default/utils/cloneAttributes.js
@@ -0,0 +1,6 @@
+export default function cloneAttributes(from, to) {
+    const attributes = from.prop('attributes');
+    $.each(attributes, function () {
+        to.attr(this.name, this.value);
+    });
+}