diff --git a/tests/cov_pytest.ini b/tests/cov_pytest.ini
index 7a0f2f32b3e..58f3820fca3 100644
--- a/tests/cov_pytest.ini
+++ b/tests/cov_pytest.ini
@@ -12,4 +12,3 @@ addopts =
     --ignore=tests/e2e/golang_router
     --ignore=tests/v1/test_schedule_output.py
     --ignore=tests/graph_optimization/test_cuda_graph_dynamic_subgraph.py
-    --ignore=tests/distributed/test_communication.py
diff --git a/tests/distributed/test_communication.py b/tests/distributed/test_communication.py
index 6906d5114e0..9df4b4ab2cc 100644
--- a/tests/distributed/test_communication.py
+++ b/tests/distributed/test_communication.py
@@ -52,7 +52,7 @@ def test_use_custom_allreduce(self, mock_custom_ar, mock_get_hcg):
         communication.use_custom_allreduce()
 
         self.assertIsNotNone(communication._TP_AR)
-        mock_custom_ar.assert_called_once_with(fake_group, 64 * 1024 * 1024)
+        mock_custom_ar.assert_called_once_with(fake_group, 8 * 1024 * 1024)
 
     def test_custom_ar_clear_ipc_handles(self):
         mock_tp_ar = MagicMock()
diff --git a/tests/engine/test_async_llm.py b/tests/engine/test_async_llm.py
index ee88b01c675..9abbce15088 100644
--- a/tests/engine/test_async_llm.py
+++ b/tests/engine/test_async_llm.py
@@ -16,10 +16,15 @@
 
 import asyncio
 import os
+import sys
 import unittest
 import uuid
 import weakref
 
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", ".."))
+
+from e2e.utils.serving_utils import clean_ports
+
 from fastdeploy.engine.args_utils import EngineArgs
 from fastdeploy.engine.async_llm import AsyncLLM
 from fastdeploy.engine.sampling_params import SamplingParams
@@ -42,6 +47,10 @@ class TestAsyncLLMEngine(unittest.TestCase):
     def setUpClass(cls):
         """Set up AsyncLLM for testing"""
         try:
+            # Clean ports before starting the engine
+            print("Pre-test port cleanup...")
+            clean_ports()
+
             # Use unique ports to avoid conflicts
             base_port = int(os.getenv("FD_ENGINE_QUEUE_PORT", "6778"))
             cache_port = int(os.getenv("FD_CACHE_QUEUE_PORT", "6779"))
diff --git a/tests/engine/test_common_engine.py b/tests/engine/test_common_engine.py
index 9c70097058c..5a6241c4433 100644
--- a/tests/engine/test_common_engine.py
+++ b/tests/engine/test_common_engine.py
@@ -16,14 +16,18 @@
 
 import asyncio
 import os
+import sys
 import threading
 import time
 import types
 import unittest
 from unittest.mock import ANY, AsyncMock, MagicMock, Mock, patch
 
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", ".."))
+
 import numpy as np
 import paddle
+from e2e.utils.serving_utils import clean_ports
 
 if not hasattr(paddle, "compat"):
 
@@ -82,6 +86,10 @@ class TestCommonEngine(unittest.TestCase):
     def setUpClass(cls):
         """Set up EngineService for testing"""
         try:
+            # Clean ports before starting the engine
+            print("Pre-test port cleanup...")
+            clean_ports()
+
             # Create engine args for testing
             engine_args = EngineArgs(
                 model=MODEL_NAME,
diff --git a/tests/engine/test_resource_manager_v1.py b/tests/engine/test_resource_manager_v1.py
index 0031a2e4f69..23275f29f70 100644
--- a/tests/engine/test_resource_manager_v1.py
+++ b/tests/engine/test_resource_manager_v1.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import os
+import sys
 import unittest
 from unittest.mock import Mock
 
@@ -20,6 +21,9 @@
 from fastdeploy.engine.request import Request, RequestStatus
 from fastdeploy.engine.sched.resource_manager_v1 import ResourceManagerV1
 
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", ".."))
+from e2e.utils.serving_utils import clean_ports
+
 MODEL_NAME = os.getenv("MODEL_PATH", "/path/to/models") + "/ERNIE-4.5-0.3B-Paddle"
 
 
@@ -28,6 +32,9 @@ class TestResourceManagerV1(unittest.TestCase):
 
     def setUp(self):
         """Set up test fixtures."""
+        # Clean ports before each test
+        clean_ports()
+
         engine_args = EngineArgs(
             model=MODEL_NAME,
             max_model_len=8192,