diff --git a/apps/desktop/src/renderer/features/editor/TiptapEditor.tsx b/apps/desktop/src/renderer/features/editor/TiptapEditor.tsx
index 689cb78..4d4783c 100644
--- a/apps/desktop/src/renderer/features/editor/TiptapEditor.tsx
+++ b/apps/desktop/src/renderer/features/editor/TiptapEditor.tsx
@@ -69,6 +69,8 @@ export function TiptapEditor() {
     ],
     content: useStore.getState().body,
     editorProps: {
+      // 关闭 Chromium 内置拼写检查——contenteditable 默认开启，会对英文技术词画红色波浪线
+      attributes: { spellcheck: 'false' },
       // FR-E6：剪贴板粘贴图片 -> 入库 .attachments -> 插入相对路径
       handlePaste: (_view, event) => {
         const ev = event as ClipboardEvent;
diff --git a/apps/desktop/src/renderer/styles.css b/apps/desktop/src/renderer/styles.css
index 4b822e6..893aed9 100644
--- a/apps/desktop/src/renderer/styles.css
+++ b/apps/desktop/src/renderer/styles.css
@@ -31,6 +31,13 @@ svg { display: block; }
   margin: 0 auto;
   caret-color: var(--accent);
 }
+/* 兜底：去掉拼写/语法错误的红色波浪下划线（即使个别 contenteditable 仍开启 spellcheck） */
+.tiptap-wrap [contenteditable="true"] :spelling-error,
+.tiptap-wrap [contenteditable="true"] :grammar-error,
+.tiptap-wrap .ProseMirror :spelling-error,
+.tiptap-wrap .ProseMirror :grammar-error {
+  text-decoration: none;
+}
 .tiptap-wrap .ProseMirror p { margin: 0.6em 0; }
 .tiptap-wrap .ProseMirror h1 { font-size: 1.8em; margin: 1em 0 0.5em; font-weight: 700; color: var(--text-primary); padding-bottom: 0.25em; border-bottom: 1px solid var(--control-border); }
 .tiptap-wrap .ProseMirror h2 { font-size: 1.5em; margin: 0.9em 0 0.45em; font-weight: 600; color: var(--text-primary); }
diff --git a/apps/desktop/tests/e2e/spellcheck-check.spec.ts b/apps/desktop/tests/e2e/spellcheck-check.spec.ts
new file mode 100644
index 0000000..770cf0d
--- /dev/null
+++ b/apps/desktop/tests/e2e/spellcheck-check.spec.ts
@@ -0,0 +1,52 @@
+import { test, expect } from '@playwright/test';
+import { _electron as electron } from 'playwright';
+import { promises as fs } from 'node:fs';
+import nodePath from 'node:path';
+import os from 'node:os';
+
+const MAIN_JS = nodePath.join(process.cwd(), 'dist-electron/main/index.js');
+
+async function launch(userData: string) {
+  const app = await electron.launch({ args: ['--user-data-dir=' + userData, MAIN_JS] });
+  const page = await app.firstWindow();
+  await page.waitForLoadState('domcontentloaded');
+  const invoke = (ch: string, args: any) => page.evaluate(({ ch, args }) => (globalThis as any).dsh.invoke(ch, args), { ch, args });
+  return { app, page, invoke };
+}
+
+// 红色波浪线修复：编辑器 contenteditable 必须关闭 Chromium 拼写检查（spellcheck=false）
+test('编辑器关闭拼写检查（去除红色波浪线）', async () => {
+  const tmp = await fs.mkdtemp(nodePath.join(os.tmpdir(), 'hn-sp-'));
+  const ud = nodePath.join(tmp, 'ud'); const v = nodePath.join(tmp, 'v');
+  await fs.mkdir(ud, { recursive: true }); await fs.mkdir(v, { recursive: true });
+  const a = await launch(ud);
+  await a.invoke('vault:switch', { root: v });
+  await a.page.getByRole('button', { name: /新建文档/ }).click();
+  await a.page.getByPlaceholder(/输入文档标题/).fill('SpellTest');
+  await a.page.getByPlaceholder(/输入文档标题/).press('Enter');
+  await expect(a.page.getByTestId('tabbar').getByText('SpellTest', { exact: true })).toBeVisible({ timeout: 10000 });
+  const ed = a.page.locator('.ProseMirror');
+  await ed.click();
+  await a.page.keyboard.type('WordPress caddy gitea Lsky');
+  await a.page.waitForTimeout(300);
+  // 主编辑器 spellcheck 属性必须为 false（Chromium 据此关闭红色波浪线）
+  const sc = await a.page.locator('.ProseMirror').getAttribute('spellcheck');
+  console.log('SPELLCHECK', sc);
+  expect(sc).toBe('false');
+  // CSS 兜底样式存在：spelling-error / grammar-error 无红色波浪下划线
+  const cssOk = await a.page.evaluate(() => {
+    const sheets = Array.from(document.styleSheets);
+    for (const s of sheets) {
+      try {
+        const rules = Array.from((s as CSSStyleSheet).cssRules);
+        for (const r of rules) {
+          const css = (r as CSSStyleRule).cssText || '';
+          if (css.includes('spelling-error') && css.includes('text-decoration')) return true;
+        }
+      } catch { /* cross-origin */ }
+    }
+    return false;
+  });
+  console.log('CSS_FALLBACK', cssOk);
+  await a.app.close();
+});
\ No newline at end of file