diff --git a/.changeset/tiny-pianos-enter.md b/.changeset/tiny-pianos-enter.md
new file mode 100644
index 0000000000..aa04d4b71b
--- /dev/null
+++ b/.changeset/tiny-pianos-enter.md
@@ -0,0 +1,5 @@
+---
+"@lynx-js/web-elements": patch
+---
+
+fix: line-height of markdown-style should be added `px`
diff --git a/packages/web-platform/web-elements/src/elements/XMarkdown/XMarkdownAttributes.ts b/packages/web-platform/web-elements/src/elements/XMarkdown/XMarkdownAttributes.ts
index dfa7b1a1bb..c9a6b6e444 100644
--- a/packages/web-platform/web-elements/src/elements/XMarkdown/XMarkdownAttributes.ts
+++ b/packages/web-platform/web-elements/src/elements/XMarkdown/XMarkdownAttributes.ts
@@ -380,7 +380,6 @@ const preprocessInlineView = (html: string) =>
 
 const unitlessCssProperties = new Set([
   'font-weight',
-  'line-height',
   'opacity',
   'z-index',
   'flex',
diff --git a/packages/web-platform/web-elements/tests/fixtures/x-markdown/style.html b/packages/web-platform/web-elements/tests/fixtures/x-markdown/style.html
index 2013fa7eb8..e6333a6020 100644
--- a/packages/web-platform/web-elements/tests/fixtures/x-markdown/style.html
+++ b/packages/web-platform/web-elements/tests/fixtures/x-markdown/style.html
@@ -36,6 +36,7 @@
         },
         link: {
           color: 'ff0000',
+          lineHeight: 24,
         },
         inlineCode: {
           color: '0000ff',
diff --git a/packages/web-platform/web-elements/tests/x-markdown.spec.ts b/packages/web-platform/web-elements/tests/x-markdown.spec.ts
index 050e128a41..336e9fb70b 100644
--- a/packages/web-platform/web-elements/tests/x-markdown.spec.ts
+++ b/packages/web-platform/web-elements/tests/x-markdown.spec.ts
@@ -104,9 +104,14 @@ test.describe('x-markdown', () => {
   test('should apply markdown-style updates', async ({ page }) => {
     await goto(page, 'x-markdown/style');
     const markdown = page.locator('x-markdown');
+    await page.waitForFunction(() => {
+      const element = document.querySelector('x-markdown');
+      return element?.shadowRoot?.querySelector('a')?.textContent === 'link';
+    });
 
     const link = markdown.locator('a');
     await expect(link).toHaveCSS('color', 'rgb(255, 0, 0)');
+    await expect(link).toHaveCSS('line-height', '24px');
 
     const inlineCode = markdown.locator('code').first();
     await expect(inlineCode).toHaveCSS('color', 'rgb(0, 0, 255)');