diff --git a/api/tests/unit_tests/conftest.py b/api/tests/unit_tests/conftest.py
index e09acc4c39..273fb7208a 100644
--- a/api/tests/unit_tests/conftest.py
+++ b/api/tests/unit_tests/conftest.py
@@ -2,6 +2,7 @@ import os
 
 import pytest
 from flask import Flask
+from unittest.mock import MagicMock, patch
 
 # Getting the absolute path of the current file's directory
 ABS_PATH = os.path.dirname(os.path.abspath(__file__))
@@ -11,6 +12,24 @@ PROJECT_DIR = os.path.abspath(os.path.join(ABS_PATH, os.pardir, os.pardir))
 
 CACHED_APP = Flask(__name__)
 
+# set global mock for Redis client
+redis_mock = MagicMock()
+redis_mock.get = MagicMock(return_value=None)
+redis_mock.setex = MagicMock()
+redis_mock.setnx = MagicMock()
+redis_mock.delete = MagicMock()
+redis_mock.lock = MagicMock()
+redis_mock.exists = MagicMock(return_value=False)
+redis_mock.set = MagicMock()
+redis_mock.expire = MagicMock()
+redis_mock.hgetall = MagicMock(return_value={})
+redis_mock.hdel = MagicMock()
+redis_mock.incr = MagicMock(return_value=1)
+
+# apply the mock to the Redis client in the Flask app
+redis_patcher = patch("extensions.ext_redis.redis_client", redis_mock)
+redis_patcher.start()
+
 
 @pytest.fixture
 def app() -> Flask:
@@ -21,3 +40,20 @@ def app() -> Flask:
 def _provide_app_context(app: Flask):
     with app.app_context():
         yield
+
+
+@pytest.fixture(autouse=True)
+def reset_redis_mock():
+    """在每个测试前重置 Redis mock"""
+    redis_mock.reset_mock()
+    redis_mock.get.return_value = None
+    redis_mock.setex.return_value = None
+    redis_mock.setnx.return_value = None
+    redis_mock.delete.return_value = None
+    redis_mock.exists.return_value = False
+    redis_mock.set.return_value = None
+    redis_mock.expire.return_value = None
+    redis_mock.hgetall.return_value = {}
+    redis_mock.hdel.return_value = None
+    redis_mock.incr.return_value = 1
+    yield
diff --git a/api/tests/unit_tests/services/test_dataset_service.py b/api/tests/unit_tests/services/test_dataset_service.py
index 65bd616293..5c4a843b95 100644
--- a/api/tests/unit_tests/services/test_dataset_service.py
+++ b/api/tests/unit_tests/services/test_dataset_service.py
@@ -6,18 +6,12 @@ from unittest.mock import MagicMock, Mock, call, patch
 
 import pytest
 
-redis_mock = MagicMock()
-redis_mock.get = Mock(return_value=None)
-redis_mock.setex = Mock()
-redis_mock.setnx = Mock()
-redis_mock.delete = Mock()
-redis_mock.lock = Mock()
-
-# Mock Redis client to avoid initialization issues during import
-with patch("extensions.ext_redis.redis_client", redis_mock):
-    from models.dataset import Dataset, Document
-    from services.dataset_service import DocumentService
-    from services.errors.document import DocumentIndexingError
+# 从 conftest.py 导入全局的 redis_mock
+from tests.unit_tests.conftest import redis_mock
+
+from models.dataset import Dataset, Document
+from services.dataset_service import DocumentService
+from services.errors.document import DocumentIndexingError
 
 
 class TestDatasetServiceBatchUpdateDocumentStatus(unittest.TestCase):