diff --git a/media_platform/douyin/core.py b/media_platform/douyin/core.py
index f798665..e75904b 100644
--- a/media_platform/douyin/core.py
+++ b/media_platform/douyin/core.py
@@ -44,7 +44,11 @@ from . import media as douyin_media
 from .client import DouYinClient
 from .exception import DataFetchError
 from .field import PublishTimeType
-from .help import parse_video_info_from_url, parse_creator_info_from_url
+from .help import (
+    client_hint_headers,
+    parse_creator_info_from_url,
+    parse_video_info_from_url,
+)
 from .login import DouYinLogin
 
 
@@ -320,10 +324,17 @@ class DouYinCrawler(AbstractCrawler):
             self.browser_context,
             urls=self.cookie_urls,
         )  # type: ignore
+        # 声称自己是 Chrome，就得带上 sec-ch-ua 系列头 —— 浏览器一定会带，而缺了它们
+        # 的请求在抖音网关看来就是机器人：回一个 **200 + 空 body**，不报错、不给原因，
+        # 表现为采集抓到 0 条。见 help.client_hint_headers 的实测记录。
+        client_hints = client_hint_headers(
+            await self.context_page.evaluate("() => navigator.userAgentData || null")
+        )
         douyin_client = DouYinClient(
             proxy=httpx_proxy,
             headers={
                 "User-Agent": await self.context_page.evaluate("() => navigator.userAgent"),
+                **client_hints,
                 "Cookie": cookie_str,
                 "Host": "www.douyin.com",
                 "Origin": "https://www.douyin.com/",
diff --git a/media_platform/douyin/help.py b/media_platform/douyin/help.py
index 0d7e6ad..d18eb73 100644
--- a/media_platform/douyin/help.py
+++ b/media_platform/douyin/help.py
@@ -26,7 +26,7 @@
 
 import random
 import re
-from typing import Optional
+from typing import Dict, Optional
 
 import execjs
 from playwright.async_api import Page
@@ -98,6 +98,38 @@ async def get_a_bogus_from_playwright(params: str, post_data: dict, user_agent:
     return a_bogus
 
 
+def client_hint_headers(user_agent_data) -> Dict[str, str]:
+    """由 ``navigator.userAgentData`` 还原 ``sec-ch-ua`` 系列请求头。
+
+    浏览器只要声称自己是 Chrome，就**一定会**带这三个头。缺了它们，「Chrome 的 UA +
+    没有 sec-ch-ua」就是最典型的机器人特征 —— 抖音网关会因此返回 **200 + 空 body**：
+    不报错、不给原因、HTTP 状态还是成功的，表现为采集拿到 0 条。
+
+    实测（同一 URL、同一 cookie、同一参数）：不带头 → 0 字节；补上这三个头 → 7077 字节。
+
+    从 ``userAgentData`` 现算而不是写死，是为了 Chrome 升级后不会悄悄失配 —— 写死的
+    版本号和 UA 里的版本号一旦对不上，就又是一个可疑特征。
+    """
+    if not isinstance(user_agent_data, dict):
+        return {}
+
+    brands = user_agent_data.get("brands") or []
+    sec_ch_ua = ", ".join(
+        f'"{brand.get("brand", "")}";v="{brand.get("version", "")}"' for brand in brands
+    )
+    if not sec_ch_ua:
+        return {}
+
+    headers = {
+        "sec-ch-ua": sec_ch_ua,
+        "sec-ch-ua-mobile": "?1" if user_agent_data.get("mobile") else "?0",
+    }
+    platform = user_agent_data.get("platform")
+    if platform:
+        headers["sec-ch-ua-platform"] = f'"{platform}"'
+    return headers
+
+
 def parse_video_info_from_url(url: str) -> VideoUrlInfo:
     """
     Parse video ID from Douyin video URL
diff --git a/tests/test_douyin_client_hints.py b/tests/test_douyin_client_hints.py
new file mode 100644
index 0000000..cba579d
--- /dev/null
+++ b/tests/test_douyin_client_hints.py
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+"""sec-ch-ua 系列请求头：为什么必须带、怎么还原。
+
+抖音网关对「声称自己是 Chrome、却没带 sec-ch-ua」的请求会回 **200 + 空 body** ——
+不报错、不给原因、HTTP 状态还是成功的，采集侧只看到 0 条。实测同一 URL、同一 cookie、
+同一参数：不带头 0 字节，补上这三个头 7077 字节。
+"""
+
+import pytest
+
+from media_platform.douyin.help import client_hint_headers
+
+# 实测从真实浏览器抓到的 navigator.userAgentData
+REAL_UA_DATA = {
+    "brands": [
+        {"brand": "Google Chrome", "version": "155"},
+        {"brand": "Chromium", "version": "155"},
+        {"brand": "Not(A:Brand", "version": "24"},
+    ],
+    "mobile": False,
+    "platform": "Linux",
+}
+
+
+def test_headers_are_derived_from_user_agent_data():
+    hints = client_hint_headers(REAL_UA_DATA)
+
+    assert hints["sec-ch-ua"] == (
+        '"Google Chrome";v="155", "Chromium";v="155", "Not(A:Brand";v="24"'
+    )
+    assert hints["sec-ch-ua-mobile"] == "?0"
+    assert hints["sec-ch-ua-platform"] == '"Linux"'
+
+
+def test_mobile_is_reflected():
+    hints = client_hint_headers({**REAL_UA_DATA, "mobile": True})
+
+    assert hints["sec-ch-ua-mobile"] == "?1"
+
+
+@pytest.mark.parametrize("value", [None, [], "not-a-dict", {}, {"brands": []}])
+def test_nothing_is_invented_when_user_agent_data_is_unavailable(value):
+    """拿不到就返回空。
+
+    凭空造一组和 UA 对不上的头，只会变成**另一个**可疑特征 —— 那比不带头更糟。
+    """
+    assert client_hint_headers(value) == {}
+
+
+def test_missing_platform_still_sends_the_other_two():
+    hints = client_hint_headers({"brands": REAL_UA_DATA["brands"], "mobile": False})
+
+    assert "sec-ch-ua" in hints
+    assert "sec-ch-ua-mobile" in hints
+    assert "sec-ch-ua-platform" not in hints