diff --git a/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.spec.tsx b/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.spec.tsx
index 3018cb8..fd8a89c 100644
--- a/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.spec.tsx
+++ b/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.spec.tsx
@@ -31,8 +31,11 @@ class FakeEditor {
 
   public commands = {
     focus: () => true,
-    setContent: (value: string) => {
+    setContent: (value: string, options?: { emitUpdate?: boolean }) => {
       this.html = value;
+      if (options?.emitUpdate !== false) {
+        this.options.onUpdate?.({ editor: this });
+      }
       return true;
     },
   };
@@ -316,6 +319,8 @@ describe('ktTiptapHtmlEditor', () => {
     );
     await nextTick();
 
+    expect(wrapper.emitted('update:modelValue')).toHaveLength(1);
+    expect(wrapper.emitted('change')).toHaveLength(1);
     expect(wrapper.emitted('update:modelValue')?.at(-1)).toEqual([
       '<h2>新标题</h2><p>新正文</p>',
     ]);
diff --git a/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.tsx b/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.tsx
index 877e969..e5991d9 100644
--- a/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.tsx
+++ b/apps/web-antdv-next/src/components/richText/KtTiptapHtmlEditor.tsx
@@ -540,7 +540,7 @@ export default defineComponent({
         return;
       }
 
-      currentEditor.commands.setContent(value);
+      currentEditor.commands.setContent(value, { emitUpdate: false });
       emitHtmlChange(readEditorHtml(currentEditor, value), previousHtml);
     }
 
@@ -557,7 +557,7 @@ export default defineComponent({
         if (nextHtml === currentHtml.value) return;
 
         currentHtml.value = nextHtml;
-        editor.value?.commands.setContent(nextHtml);
+        editor.value?.commands.setContent(nextHtml, { emitUpdate: false });
       },
     );
 
diff --git a/apps/web-antdv-next/src/views/blog/modules/article-form.spec.ts b/apps/web-antdv-next/src/views/blog/modules/article-form.spec.ts
index 4601a25..fe37d39 100644
--- a/apps/web-antdv-next/src/views/blog/modules/article-form.spec.ts
+++ b/apps/web-antdv-next/src/views/blog/modules/article-form.spec.ts
@@ -19,7 +19,7 @@ describe('blog article form helpers', () => {
     const values = getBlogArticleEditFormValues({
       categories: ['技术'],
       contentHtml:
-        '<pre class="wp-block-code hljs-codeblock"><code class="hljs sql">select 1;</code></pre>',
+        '<pre class="wp-block-code hljs-codeblock"><code class="hljs sql"><table class="hljs-ln"><tbody><tr><td class="hljs-ln-line hljs-ln-code">select 1;</td></tr></tbody></table></code><div class="hljs-control"></div></pre>',
       contentMarkdown: '```sql\nselect 1;\n```',
       excerpt: '摘要',
       id: '50',
@@ -34,6 +34,43 @@ describe('blog article form helpers', () => {
     expect(values.content).toContain('hljs-codeblock');
   });
 
+  it('keeps existing markdown articles in markdown mode when rendered html is present', () => {
+    const values = getBlogArticleEditFormValues({
+      categories: [],
+      contentHtml: '<h1>标题</h1><p>正文</p>',
+      contentMarkdown: '# 标题\n\n正文',
+      excerpt: '',
+      id: '52',
+      slug: 'markdown-post',
+      status: 'publish',
+      tags: [],
+      title: 'Markdown 文章',
+    });
+
+    expect(values.editorMode).toBe('markdown');
+    expect(values.contentFormat).toBe('markdown');
+    expect(values.content).toBe('# 标题\n\n正文');
+  });
+
+  it('keeps markdown fenced code articles in markdown mode after Argon base rendering', () => {
+    const values = getBlogArticleEditFormValues({
+      categories: [],
+      contentHtml:
+        '<pre class="wp-block-code hljs-codeblock"><code class="hljs typescript">const a = 1;</code></pre>',
+      contentMarkdown: '```ts\nconst a = 1;\n```',
+      excerpt: '',
+      id: '53',
+      slug: 'markdown-code-post',
+      status: 'publish',
+      tags: [],
+      title: 'Markdown 代码文章',
+    });
+
+    expect(values.editorMode).toBe('markdown');
+    expect(values.contentFormat).toBe('markdown');
+    expect(values.content).toBe('```ts\nconst a = 1;\n```');
+  });
+
   it('edits plain HTML articles with the rich HTML editor by default', () => {
     const values = getBlogArticleEditFormValues({
       categories: [],
diff --git a/apps/web-antdv-next/src/views/blog/modules/article-form.ts b/apps/web-antdv-next/src/views/blog/modules/article-form.ts
index d98614d..dad373c 100644
--- a/apps/web-antdv-next/src/views/blog/modules/article-form.ts
+++ b/apps/web-antdv-next/src/views/blog/modules/article-form.ts
@@ -16,8 +16,9 @@ export const BLOG_ARTICLE_HTML_TEXTAREA_CLASS =
   'blog-article-form__html-source';
 export const BLOG_ARTICLE_MARKDOWN_MIN_HEIGHT = 560;
 
-const ARGON_HTML_PATTERN =
-  /\b(?:wp-block-|hljs-codeblock|hljs-ln|hljs-control|fancybox-wrapper|lazyload|collapse-block)/;
+const ARGON_BASE_CODEBLOCK_PATTERN = /\b(?:wp-block-code|hljs-codeblock)\b/;
+const SOURCE_ONLY_HTML_PATTERN =
+  /\b(?:hljs-ln|hljs-control|fancybox-wrapper|lazyload|collapse-block|wp-block-(?!code\b)[\w-]+)/;
 const HTML_TAG_PATTERN = /<\/?[a-z][\s\S]*>/i;
 
 /**
@@ -118,16 +119,18 @@ export function getContentFormatForEditorMode(
 }
 
 /**
- * Chooses the editor mode for an existing article without forcing imported Argon HTML through Tiptap or Markdown.
+ * Chooses the editor mode for an existing article without forcing Markdown source or imported Argon HTML into the wrong editor.
  * @param article Article row returned by the local blog API.
- * @returns Source HTML for Argon runtime snapshots, rich HTML for plain tags, otherwise Markdown.
+ * @returns Markdown for source-backed articles, source HTML for strong runtime DOM, rich HTML for plain tags.
  */
 export function getBlogArticleEditorMode(
   article?: Partial<WordpressBlogApi.Article>,
 ): BlogArticleEditorMode {
   const html = getRenderedValue(article?.contentHtml || article?.content);
   if (!html) return 'markdown';
-  if (ARGON_HTML_PATTERN.test(html)) return 'html-source';
+  if (SOURCE_ONLY_HTML_PATTERN.test(html)) return 'html-source';
+  if (hasMarkdownSource(article)) return 'markdown';
+  if (ARGON_BASE_CODEBLOCK_PATTERN.test(html)) return 'html-source';
   return HTML_TAG_PATTERN.test(html) ? 'html-rich' : 'markdown';
 }
 
@@ -241,6 +244,15 @@ function getRenderedValue(value?: string | WordpressBlogApi.RenderedField) {
   return value.raw || value.rendered || '';
 }
 
+/**
+ * Detects whether the article still owns an editable Markdown source snapshot.
+ * @param article Article row returned by the local blog API.
+ * @returns true when Admin should prefer Milkdown unless strong runtime-only HTML is present.
+ */
+function hasMarkdownSource(article?: Partial<WordpressBlogApi.Article>) {
+  return !!article?.contentMarkdown?.trim();
+}
+
 /**
  * Chooses editable Markdown from an API rendered field and its explicit Markdown source.
  * @param value Rendered field or string value.