diff --git a/api_v1/utils/tencentcloud_tiia.py b/api_v1/utils/tencentcloud_tiia.py
index 918e0fe..fe9f5d1 100644
--- a/api_v1/utils/tencentcloud_tiia.py
+++ b/api_v1/utils/tencentcloud_tiia.py
@@ -45,9 +45,25 @@ class SimpleRateLimiter:
             time.sleep(self._min_interval - elapsed)
         self._last_ts = time.monotonic()
 
+def _strip_data_url_base64_prefix(s: str) -> str:
+    """
+    Accept both raw base64 and data URL format like:
+      data:image/png;base64,AAAA...
+    Return the base64 payload part.
+    """
+    s = (s or '').strip()
+    if not s:
+        return s
+    lower = s[:64].lower()
+    if lower.startswith('data:') and 'base64,' in lower:
+        return s.split('base64,', 1)[1].strip()
+    return s
+
+
 def search_image_url_in_tencent_tiia(
     *,
-    image_url: str,
+    image_url: str | None = None,
+    image_base64: str | None = None,
     limit: int | None = 10,
     offset: int | None = 0,
     match_threshold: int | None = None,
@@ -69,7 +85,8 @@ def search_image_url_in_tencent_tiia(
     - TENCENTCLOUD_TIIA_ENDPOINT              (default: tiia.tencentcloudapi.com)
 
     Args:
-        image_url: Absolute URL to search.
+        image_url: Absolute URL to search. (preferred when both provided)
+        image_base64: Base64-encoded image content.
         limit/offset/match_threshold: Optional SearchImage request parameters.
         rate_limiter: Optional in-process limiter to keep requests under QPS.
 
@@ -77,12 +94,15 @@ def search_image_url_in_tencent_tiia(
         Parsed JSON response dict from TencentCloud SDK.
     """
     image_url = (image_url or '').strip()
-    if not image_url:
-        raise ValueError('image_url 不能为空')
+    image_base64 = _strip_data_url_base64_prefix(image_base64 or '')
 
-    parsed = urlparse(image_url)
-    if not (parsed.scheme and parsed.netloc):
-        raise ValueError('image_url 必须为绝对 URL（包含 scheme 与 host）')
+    if not image_url and not image_base64:
+        raise ValueError('imageUrl 和 imageBase64 必须至少提供一个')
+
+    if image_url:
+        parsed = urlparse(image_url)
+        if not (parsed.scheme and parsed.netloc):
+            raise ValueError('imageUrl 必须为绝对 URL（包含 scheme 与 host）')
 
     group_id = (getattr(settings, 'TENCENTCLOUD_TIIA_GROUP_ID', '') or '').strip()
     if not group_id:
@@ -117,7 +137,11 @@ def search_image_url_in_tencent_tiia(
 
     req = models.SearchImageRequest()
     req.GroupId = str(group_id)
-    req.ImageUrl = str(image_url)
+    # TencentCloud: ImageUrl + ImageBase64 can be both provided, but ImageUrl wins.
+    if image_url:
+        req.ImageUrl = str(image_url)
+    else:
+        req.ImageBase64 = str(image_base64)
 
     if limit is not None:
         req.Limit = int(limit)
diff --git a/api_v1/views/test_tiia_search_image_api.py b/api_v1/views/test_tiia_search_image_api.py
index 1fa8a3b..759231b 100644
--- a/api_v1/views/test_tiia_search_image_api.py
+++ b/api_v1/views/test_tiia_search_image_api.py
@@ -41,6 +41,37 @@ class TiiaSearchImageAPITestCase(TestCase):
         )
         self.assertEqual(resp.status_code, status.HTTP_200_OK)
         self.assertEqual(resp.json(), {'Candidates': [{'EntityId': '1', 'Score': 99}]})
+        mock_search.assert_called()
+
+    @patch('api_v1.views.tiia.search_image_url_in_tencent_tiia')
+    def test_search_image_success_base64(self, mock_search):
+        self.client.force_authenticate(self.user)
+        mock_search.return_value = {'Candidates': []}
+
+        resp = self.client.post(
+            '/api/v1/tiia/search-image/',
+            data={'imageBase64': 'iVBORw0KGgoAAAANSUhEUgAAAAUA'},  # dummy
+            format='json',
+        )
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        mock_search.assert_called()
+
+    @patch('api_v1.views.tiia.search_image_url_in_tencent_tiia')
+    def test_search_image_both_params_url_wins(self, mock_search):
+        self.client.force_authenticate(self.user)
+        mock_search.return_value = {'Candidates': []}
+
+        resp = self.client.post(
+            '/api/v1/tiia/search-image/',
+            data={
+                'imageUrl': 'https://example.com/a.png',
+                'imageBase64': 'iVBORw0KGgoAAAANSUhEUgAAAAUA',
+            },
+            format='json',
+        )
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        _, kwargs = mock_search.call_args
+        self.assertEqual(kwargs.get('image_url'), 'https://example.com/a.png')
 
     def test_search_image_missing_image_url(self):
         self.client.force_authenticate(self.user)
diff --git a/api_v1/views/tiia.py b/api_v1/views/tiia.py
index 058747d..0715a7a 100644
--- a/api_v1/views/tiia.py
+++ b/api_v1/views/tiia.py
@@ -34,16 +34,16 @@ class TiiaSearchImageView(APIView):
     permission_classes = [IsAuthenticated]
 
     def post(self, request):
-        image_url = (
-            request.data.get('imageUrl')
-            or request.data.get('ImageUrl')
-            or request.data.get('image_url')
-            or request.data.get('ImageURL')
-        )
+        # Keep API params consistent with existing style for this endpoint:
+        # - imageUrl
+        # - imageBase64
+        image_url = request.data.get('imageUrl')
+        image_base64 = request.data.get('imageBase64')
         try:
             limiter = SimpleRateLimiter(qps=float(getattr(settings, 'TENCENTCLOUD_TIIA_QPS', 10)))
             resp = search_image_url_in_tencent_tiia(
-                image_url=str(image_url or ''),
+                image_url=str(image_url or '') if image_url is not None else None,
+                image_base64=str(image_base64 or '') if image_base64 is not None else None,
                 rate_limiter=limiter,
             )
             return Response(resp, status=status.HTTP_200_OK)