diff --git a/.changeset/bright-flies-sit.md b/.changeset/bright-flies-sit.md
new file mode 100644
index 000000000000..0615a6601aa9
--- /dev/null
+++ b/.changeset/bright-flies-sit.md
@@ -0,0 +1,7 @@
+---
+'@modern-js/doc-core': patch
+---
+
+fix(doc-core): flatten error when meeting `$` in mdx file
+
+fix(doc-core): 当出现 `$` 字符时，mdx 内容扁平化结果异常
diff --git a/packages/cli/doc-core/src/node/utils/flattenMdxContent.ts b/packages/cli/doc-core/src/node/utils/flattenMdxContent.ts
index 0b41e0a1f3b8..d5f6b5abc85f 100644
--- a/packages/cli/doc-core/src/node/utils/flattenMdxContent.ts
+++ b/packages/cli/doc-core/src/node/utils/flattenMdxContent.ts
@@ -101,11 +101,12 @@ export async function flattenMdxContent(
     if (MDX_REGEXP.test(absoluteImportPath)) {
       // replace import statement with the content of the imported file
       const importedContent = fs.readFileSync(absoluteImportPath, 'utf-8');
-
-      result = result.replace(
-        new RegExp(`<${id}\\s*/>`),
-        await flattenMdxContent(importedContent, absoluteImportPath, alias),
+      const replacedValue = await flattenMdxContent(
+        importedContent,
+        absoluteImportPath,
+        alias,
       );
+      result = result.replace(new RegExp(`<${id}\\s*/>`), () => replacedValue);
     }
   }