diff --git a/src/components/markdown/CodeBlock.tsx b/src/components/markdown/CodeBlock.tsx
index d7f2a3d..1dd0596 100644
--- a/src/components/markdown/CodeBlock.tsx
+++ b/src/components/markdown/CodeBlock.tsx
@@ -88,9 +88,8 @@ export function CodeBlock({
   // 规范化语言名称
   const normalizedLanguage = languageAliases[language.toLowerCase()] || language.toLowerCase();
 
-  // 判断是否支持 HTML 预览
-  const isHtmlPreviewable = ['html', 'htm', 'markup'].includes(normalizedLanguage) ||
-                            ['html', 'htm'].includes(language.toLowerCase());
+  // 判断是否支持 HTML 预览（仅 html/htm，不包括 xml/svg）
+  const isHtmlPreviewable = ['html', 'htm'].includes(language.toLowerCase());
 
   // 判断是否可执行：语言支持 + 代码满足执行条件
   const canRun = isRunnableLanguage(language) && isCodeExecutable(code, language);