diff --git a/packages/ui-default/build/config/webpack.js b/packages/ui-default/build/config/webpack.js
index 6c29d4bfe..0be6cf76e 100644
--- a/packages/ui-default/build/config/webpack.js
+++ b/packages/ui-default/build/config/webpack.js
@@ -175,7 +175,7 @@ export default function (env = {}) {
       }),
       new MonacoWebpackPlugin({
         // available options are documented at https://github.com/Microsoft/monaco-editor-webpack-plugin#options
-        languages: ['cpp', 'csharp', 'java', 'javascript', 'python', 'rust', 'ruby', 'php', 'pascal', 'go', 'julia'],
+        languages: ['markdown', 'yaml', 'cpp', 'csharp', 'java', 'javascript', 'python', 'rust', 'ruby', 'php', 'pascal', 'go', 'julia'],
       }),
       new StaticManifestPlugin({
         fileName: 'static-manifest.json',
diff --git a/packages/ui-default/components/discussion/CommentBox.js b/packages/ui-default/components/discussion/CommentBox.js
index 82ed55aba..a2a85cc38 100644
--- a/packages/ui-default/components/discussion/CommentBox.js
+++ b/packages/ui-default/components/discussion/CommentBox.js
@@ -1,7 +1,7 @@
 import _ from 'lodash';
 import DOMAttachedObject from 'vj/components/DOMAttachedObject';
 import request from 'vj/utils/request';
-import TextareaHandler from 'vj/components/cmeditor/textareaHandler';
+import TextareaHandler from 'vj/components/editor/textareaHandler';
 import Notification from 'vj/components/notification';
 
 let initialized = false;
diff --git a/packages/ui-default/components/cmeditor/EditorComponent.jsx b/packages/ui-default/components/editor/EditorComponent.jsx
similarity index 100%
rename from packages/ui-default/components/cmeditor/EditorComponent.jsx
rename to packages/ui-default/components/editor/EditorComponent.jsx
diff --git a/packages/ui-default/components/cmeditor/cmeditor.page.js b/packages/ui-default/components/editor/cmeditor.page.js
similarity index 100%
rename from packages/ui-default/components/cmeditor/cmeditor.page.js
rename to packages/ui-default/components/editor/cmeditor.page.js
diff --git a/packages/ui-default/components/cmeditor/cmeditor.styl b/packages/ui-default/components/editor/cmeditor.styl
similarity index 100%
rename from packages/ui-default/components/cmeditor/cmeditor.styl
rename to packages/ui-default/components/editor/cmeditor.styl
diff --git a/packages/ui-default/components/cmeditor/index.js b/packages/ui-default/components/editor/index.js
similarity index 54%
rename from packages/ui-default/components/cmeditor/index.js
rename to packages/ui-default/components/editor/index.js
index 6edcf6caa..be461a9c4 100644
--- a/packages/ui-default/components/cmeditor/index.js
+++ b/packages/ui-default/components/editor/index.js
@@ -24,23 +24,62 @@ export const config = {
   },
 };
 
-export default class CmEditor extends DOMAttachedObject {
-  static DOMAttachKey = 'vjCmEditorInstance';
+export default class Editor extends DOMAttachedObject {
+  static DOMAttachKey = 'vjEditorInstance';
 
   constructor($dom, options = {}) {
     super($dom);
     this.options = options;
-    this.init();
+    if (UserContext.preferredEditorType === 'monaco') this.initMonaco();
+    else this.initVditor();
   }
 
-  async init() {
+  async initMonaco() {
+    const monaco = await import('monaco-editor/esm/vs/editor/editor.api');
+    const { $dom } = this;
+    const hasFocus = $dom.is(':focus');
+    const origin = $dom.get(0);
+    const ele = document.createElement('div');
+    $(ele).height(550);
+    $(ele).width('100%');
+    $(ele).addClass('textbox');
+    $dom.hide();
+    origin.parentElement.appendChild(ele);
+    const value = $dom.val();
+    const {
+      onChange, language = 'markdown', theme = 'vs-light', model = `file://model-${Math.random().toString(16)}`,
+    } = this.options;
+    this.model = monaco.editor.createModel(value, language, monaco.Uri.parse(model));
+    this.editor = monaco.editor.create(
+      ele,
+      {
+        theme,
+        lineNumbers: true,
+        glyphMargin: true,
+        lightbulb: {
+          enabled: true,
+        },
+        model: this.model,
+      }
+    );
+    this._subscription = this.editor.onDidChangeModelContent(() => {
+      const val = this.editor.getValue();
+      $dom.val(val);
+      $dom.text(val);
+      if (onChange) onChange(val);
+    });
+    this.isValid = true;
+    if (hasFocus) this.editor.focus();
+  }
+
+  async initVditor() {
     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.val();
-    const onChange = this.options.onChange;
+    const { onChange } = this.options;
     await new Promise((resolve) => {
       this.editor = new Vditor(ele, {
         ...config,
@@ -78,4 +117,4 @@ export default class CmEditor extends DOMAttachedObject {
   }
 }
 
-_.assign(CmEditor, DOMAttachedObject);
+_.assign(Editor, DOMAttachedObject);
diff --git a/packages/ui-default/components/cmeditor/textareaHandler.js b/packages/ui-default/components/editor/textareaHandler.js
similarity index 90%
rename from packages/ui-default/components/cmeditor/textareaHandler.js
rename to packages/ui-default/components/editor/textareaHandler.js
index 572742180..90924319f 100644
--- a/packages/ui-default/components/cmeditor/textareaHandler.js
+++ b/packages/ui-default/components/editor/textareaHandler.js
@@ -1,12 +1,12 @@
 import _ from 'lodash';
 import DOMAttachedObject from 'vj/components/DOMAttachedObject';
-import CmEditor from './index';
+import Editor from './index';
 
 export default class TextareaHandler extends DOMAttachedObject {
   static DOMAttachKey = 'vjTextareaHandlerInstance';
 
   getCmEditor() {
-    return CmEditor.get(this.$dom);
+    return Editor.get(this.$dom);
   }
 
   isCmEditor() {
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 79ec75802..453034174 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.6.26",
+  "version": "4.6.27",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/pages/problem_edit.page.js b/packages/ui-default/pages/problem_edit.page.js
index b49391166..13d247daf 100644
--- a/packages/ui-default/pages/problem_edit.page.js
+++ b/packages/ui-default/pages/problem_edit.page.js
@@ -5,7 +5,7 @@ import tpl from 'vj/utils/tpl';
 import i18n from 'vj/utils/i18n';
 import { ConfirmDialog } from 'vj/components/dialog';
 import Dropdown from 'vj/components/dropdown/Dropdown';
-import CmEditor from 'vj/components/cmeditor/index';
+import Editor from 'vj/components/editor/index';
 
 const categories = {};
 const dirtyCategories = [];
@@ -253,6 +253,6 @@ export default new NamedPage(['problem_create', 'problem_edit'], (pagename) => {
       else content[i] = val;
       $main.val(JSON.stringify(content));
     }
-    CmEditor.getOrConstruct($dom, { upload, onChange });
+    Editor.getOrConstruct($dom, { upload, onChange });
   });
 });
diff --git a/packages/ui-default/setting.yaml b/packages/ui-default/setting.yaml
index accd561d4..e6655296e 100644
--- a/packages/ui-default/setting.yaml
+++ b/packages/ui-default/setting.yaml
@@ -86,6 +86,7 @@ preferredEditorType:
     wysiwyg: WYSIWYG
     ir: Instant Rendering
     sv: Split View
+    monaco: Monaco Editor
   family: markdown
   category: preference
   value: sv
diff --git a/packages/ui-default/theme/98.js b/packages/ui-default/theme/98.js
index f358ccdd0..26021b22d 100644
--- a/packages/ui-default/theme/98.js
+++ b/packages/ui-default/theme/98.js
@@ -16,7 +16,7 @@ import 'vj/misc/structure.styl';
 import 'vj/misc/section.98.styl';
 import 'vj/misc/nothing.styl';
 
-import 'vj/components/cmeditor/cmeditor.styl';
+import 'vj/components/editor/cmeditor.styl';
 import 'vj/components/datepicker/datepicker.styl';
 import 'vj/components/katex/katex.styl';
 
diff --git a/packages/ui-default/theme/default.js b/packages/ui-default/theme/default.js
index 7623e0ea9..142b070c4 100644
--- a/packages/ui-default/theme/default.js
+++ b/packages/ui-default/theme/default.js
@@ -17,7 +17,7 @@ import 'vj/misc/structure.styl';
 import 'vj/misc/section.styl';
 import 'vj/misc/nothing.styl';
 
-import 'vj/components/cmeditor/cmeditor.styl';
+import 'vj/components/editor/cmeditor.styl';
 import 'vj/components/datepicker/datepicker.styl';
 import 'vj/components/katex/katex.styl';