diff --git a/metagpt/config2.py b/metagpt/config2.py
index 243a98078..393c46200 100644
--- a/metagpt/config2.py
+++ b/metagpt/config2.py
@@ -156,7 +156,8 @@ def merge_dict(dicts: Iterable[Dict]) -> Dict:
 class ConfigMixin(BaseModel):
     """Mixin class for configurable objects"""
 
-    config: Optional[Config] = None
+    # Env/Role/Action will use this config as private config, or use self.context.config as public config
+    _config: Optional[Config] = None
 
     def __init__(self, config: Optional[Config] = None, **kwargs):
         """Initialize with config"""
@@ -164,13 +165,13 @@ class ConfigMixin(BaseModel):
         self.set_config(config)
 
     def set(self, k, v, override=False):
-        """Try to set parent config if not set"""
+        """Set attribute"""
         if override or not self.__dict__.get(k):
             self.__dict__[k] = v
 
     def set_config(self, config: Config, override=False):
         """Set config"""
-        self.set("config", config, override)
+        self.set("_config", config, override)
 
 
 config = Config.default()
diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index 42996bea8..88bab72cb 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -30,6 +30,7 @@ from pydantic import BaseModel, ConfigDict, Field, SerializeAsAny, model_validat
 from metagpt.actions import Action, ActionOutput
 from metagpt.actions.action_node import ActionNode
 from metagpt.actions.add_requirement import UserRequirement
+from metagpt.config2 import ConfigMixin
 from metagpt.context import Context, context
 from metagpt.llm import LLM
 from metagpt.logs import logger
@@ -119,7 +120,7 @@ class RoleContext(BaseModel):
         return self.memory.get()
 
 
-class Role(SerializationMixin):
+class Role(SerializationMixin, ConfigMixin, BaseModel):
     """Role/Agent"""
 
     model_config = ConfigDict(arbitrary_types_allowed=True, exclude=["llm"])
diff --git a/tests/metagpt/test_config.py b/tests/metagpt/test_config.py
index bd22bf88b..0a2c0d462 100644
--- a/tests/metagpt/test_config.py
+++ b/tests/metagpt/test_config.py
@@ -53,12 +53,12 @@ def test_config_mixin_2():
     i = Config(llm={"default": mock_llm_config})
     j = Config(llm={"new": mock_llm_config})
     obj = ModelX(config=i)
-    assert obj.config == i
-    assert obj.config.llm["default"] == mock_llm_config
+    assert obj._config == i
+    assert obj._config.llm["default"] == mock_llm_config
 
     obj.set_config(j)
     # obj already has a config, so it will not be set
-    assert obj.config == i
+    assert obj._config == i
 
 
 def test_config_mixin_3():
@@ -66,13 +66,13 @@ def test_config_mixin_3():
     i = Config(llm={"default": mock_llm_config})
     j = Config(llm={"new": mock_llm_config})
     obj = ModelY(config=i)
-    assert obj.config == i
-    assert obj.config.llm["default"] == mock_llm_config
+    assert obj._config == i
+    assert obj._config.llm["default"] == mock_llm_config
 
     obj.set_config(j)
     # obj already has a config, so it will not be set
-    assert obj.config == i
-    assert obj.config.llm["default"] == mock_llm_config
+    assert obj._config == i
+    assert obj._config.llm["default"] == mock_llm_config
 
     assert obj.a == "a"
     assert obj.b == "b"