diff --git a/sonic_platform_base/sonic_thermal_control/thermal_manager_base.py b/sonic_platform_base/sonic_thermal_control/thermal_manager_base.py
index 3b380bad34f0..7a0090264cae 100644
--- a/sonic_platform_base/sonic_thermal_control/thermal_manager_base.py
+++ b/sonic_platform_base/sonic_thermal_control/thermal_manager_base.py
@@ -25,6 +25,8 @@ class ThermalManagerBase(object):
 
     _run_thermal_algorithm_at_boot_up = None
 
+    _running = True
+
     @classmethod
     def initialize(cls):
         """
@@ -43,6 +45,14 @@ def deinitialize(cls):
         """
         pass
 
+    @classmethod
+    def stop(cls):
+        """
+        Stop thermal manager.
+        :return:
+        """
+        cls._running = False
+
     @classmethod
     def start_thermal_control_algorithm(cls):
         """
@@ -169,6 +179,8 @@ def run_policy(cls, chassis):
         cls._collect_thermal_information(chassis)
 
         for policy in cls._policy_dict.values():
+            if not cls._running:
+                return
             if policy.is_match(cls._thermal_info_dict):
                 policy.do_action(cls._thermal_info_dict)
 
@@ -180,6 +192,8 @@ def _collect_thermal_information(cls, chassis):
         :return:
         """
         for thermal_info in cls._thermal_info_dict.values():
+            if not cls._running:
+                return
             thermal_info.collect(chassis)
 
     @classmethod
diff --git a/tests/thermal_manager_test.py b/tests/thermal_manager_test.py
new file mode 100644
index 000000000000..6259c60e6c29
--- /dev/null
+++ b/tests/thermal_manager_test.py
@@ -0,0 +1,102 @@
+import os
+import sys
+
+# TODO: Clean this up once we no longer need to support Python 2
+if sys.version_info.major == 3:
+    from unittest import mock
+else:
+    import mock
+
+from sonic_platform_base.sonic_thermal_control import thermal_manager_base as tmb
+from sonic_platform_base.sonic_thermal_control import thermal_info_base
+from sonic_platform_base.sonic_thermal_control import thermal_action_base
+from sonic_platform_base.sonic_thermal_control import thermal_condition_base
+from sonic_platform_base.sonic_thermal_control import thermal_json_object
+
+
+@thermal_json_object.thermal_json_object('some_info')
+class MockThermalInfo(thermal_info_base.ThermalPolicyInfoBase):
+    pass
+
+
+@thermal_json_object.thermal_json_object('action1')
+class MockThermalAction1(thermal_action_base.ThermalPolicyActionBase):
+    def load_from_json(self, json_obj):
+        self.speed = int(json_obj['speed'])
+
+
+@thermal_json_object.thermal_json_object('action2')
+class MockThermalAction2(thermal_action_base.ThermalPolicyActionBase):
+    def load_from_json(self, json_obj):
+        self.enable = bool(json_obj['enable'])
+
+
+@thermal_json_object.thermal_json_object('condition1')
+class MockThermalCondition1(thermal_condition_base.ThermalPolicyConditionBase):
+    pass
+
+
+@thermal_json_object.thermal_json_object('condition2')
+class MockThermalCondition2(thermal_condition_base.ThermalPolicyConditionBase):
+    pass
+
+
+class MockChassis:
+    pass
+
+
+class TestThermalManagerBase:
+    @classmethod
+    def setup_class(cls):
+        tests_dir = os.path.dirname(os.path.abspath(__file__))
+        tmb.ThermalManagerBase.load(os.path.join(tests_dir, 'thermal_policy.json'))
+
+    def test_load_policy(self):
+        assert tmb.ThermalManagerBase._fan_speed_when_suspend == 60
+        assert tmb.ThermalManagerBase._run_thermal_algorithm_at_boot_up
+
+        assert 'some_info' in tmb.ThermalManagerBase._thermal_info_dict
+        some_info = tmb.ThermalManagerBase._thermal_info_dict['some_info']
+        assert isinstance(some_info, MockThermalInfo)
+
+        assert 'policy1' in tmb.ThermalManagerBase._policy_dict
+        assert 'policy2' in tmb.ThermalManagerBase._policy_dict
+        policy1 = tmb.ThermalManagerBase._policy_dict['policy1']
+        assert MockThermalCondition1 in policy1.conditions
+        assert isinstance(policy1.conditions[MockThermalCondition1], MockThermalCondition1)
+        assert MockThermalAction1 in policy1.actions
+        assert isinstance(policy1.actions[MockThermalAction1], MockThermalAction1)
+        policy2 = tmb.ThermalManagerBase._policy_dict['policy2']
+        assert MockThermalCondition2 in policy2.conditions
+        assert isinstance(policy2.conditions[MockThermalCondition2], MockThermalCondition2)
+        assert MockThermalAction2 in policy2.actions
+        assert isinstance(policy2.actions[MockThermalAction2], MockThermalAction2)
+
+    def test_run_policy(self):
+        MockThermalInfo.collect = mock.MagicMock()
+        MockThermalCondition1.is_match = mock.MagicMock(return_value=False)
+        MockThermalCondition2.is_match = mock.MagicMock(return_value=True)
+        MockThermalAction1.execute = mock.MagicMock()
+        MockThermalAction2.execute = mock.MagicMock()
+        
+        chassis = MockChassis()
+        tmb.ThermalManagerBase.run_policy(chassis)
+        assert MockThermalInfo.collect.call_count == 1
+        assert MockThermalCondition1.is_match.call_count == 1
+        assert MockThermalCondition2.is_match.call_count == 1
+        assert MockThermalAction1.execute.call_count == 0
+        assert MockThermalAction2.execute.call_count == 1
+
+        MockThermalInfo.collect.reset_mock()
+        MockThermalCondition1.is_match.reset_mock()
+        MockThermalCondition2.is_match.reset_mock()
+        tmb.ThermalManagerBase.stop()
+        tmb.ThermalManagerBase.run_policy(chassis)
+        assert MockThermalInfo.collect.call_count == 0
+        assert MockThermalCondition1.is_match.call_count == 0
+        assert MockThermalCondition2.is_match.call_count == 0
+        
+        tmb.ThermalManagerBase._collect_thermal_information = mock.MagicMock()
+        tmb.ThermalManagerBase.run_policy(chassis)
+        assert MockThermalCondition1.is_match.call_count == 0
+        assert MockThermalCondition2.is_match.call_count == 0
diff --git a/tests/thermal_policy.json b/tests/thermal_policy.json
new file mode 100644
index 000000000000..38a62f61205b
--- /dev/null
+++ b/tests/thermal_policy.json
@@ -0,0 +1,41 @@
+{   
+    "thermal_control_algorithm": {
+        "run_at_boot_up": "true",
+        "fan_speed_when_suspend": "60"
+    },
+    "info_types": [
+        {
+            "type": "some_info"
+        }
+    ],
+    "policies": [
+        {
+            "name": "policy1",
+            "conditions": [
+                {
+                    "type": "condition1"
+                }
+            ],
+            "actions": [
+                {
+                    "type": "action1",
+                    "speed": "100"
+                }
+            ]
+        },
+        {
+            "name": "policy2",
+            "conditions": [
+                {
+                    "type": "condition2"
+                }
+            ],
+            "actions": [
+                {
+                    "type": "action2",
+                    "enable": "False"
+                }
+            ]
+        }
+    ]
+}
\ No newline at end of file