diff --git a/examples/exp_pool/init_exp_pool.py b/examples/exp_pool/init_exp_pool.py
index 1601abe0b..321c38d78 100644
--- a/examples/exp_pool/init_exp_pool.py
+++ b/examples/exp_pool/init_exp_pool.py
@@ -8,7 +8,7 @@ import json
 from pathlib import Path
 
 from metagpt.const import EXAMPLE_DATA_PATH
-from metagpt.exp_pool import exp_manager
+from metagpt.exp_pool import get_exp_manager
 from metagpt.exp_pool.schema import EntryType, Experience, Metric, Score
 from metagpt.logs import logger
 from metagpt.utils.common import aread
@@ -45,7 +45,7 @@ async def add_exp(req: str, resp: str, tag: str, metric: Metric = None):
         tag=tag,
         metric=metric or Metric(score=Score(val=10, reason="Manual")),
     )
-
+    exp_manager = get_exp_manager()
     exp_manager.config.exp_pool.enable_write = True
     exp_manager.create_exp(exp)
     logger.info(f"New experience created for the request `{req[:10]}`.")
@@ -79,7 +79,7 @@ async def add_exps_from_file(tag: str, filepath: Path):
 
 def query_exps_count():
     """Queries and logs the total count of experiences in the pool."""
-
+    exp_manager = get_exp_manager()
     count = exp_manager.get_exps_count()
     logger.info(f"Experiences Count: {count}")
 
diff --git a/examples/exp_pool/manager.py b/examples/exp_pool/manager.py
index ae998214a..5aead08e9 100644
--- a/examples/exp_pool/manager.py
+++ b/examples/exp_pool/manager.py
@@ -6,7 +6,7 @@ This script creates a new experience, logs its creation, and then queries for ex
 
 import asyncio
 
-from metagpt.exp_pool import exp_manager
+from metagpt.exp_pool import get_exp_manager
 from metagpt.exp_pool.schema import EntryType, Experience
 from metagpt.logs import logger
 
@@ -15,6 +15,7 @@ async def main():
     # Define the simple request and response
     req = "Simple req"
     resp = "Simple resp"
+    exp_manager = get_exp_manager()
 
     # Add the new experience
     exp = Experience(req=req, resp=resp, entry_type=EntryType.MANUAL)
diff --git a/metagpt/rag/factories/embedding.py b/metagpt/rag/factories/embedding.py
index 8a9d4bc95..d647883bd 100644
--- a/metagpt/rag/factories/embedding.py
+++ b/metagpt/rag/factories/embedding.py
@@ -29,7 +29,7 @@ class RAGEmbeddingFactory(GenericFactory):
             LLMType.AZURE: self._create_azure,
         }
         super().__init__(creators)
-        self.config = config if self.config else Config.default()
+        self.config = config if config else Config.default()
 
     def get_rag_embedding(self, key: EmbeddingType = None) -> BaseEmbedding:
         """Key is EmbeddingType."""
diff --git a/metagpt/rag/factories/llm.py b/metagpt/rag/factories/llm.py
index 5d27cde3a..59f6db4d9 100644
--- a/metagpt/rag/factories/llm.py
+++ b/metagpt/rag/factories/llm.py
@@ -10,7 +10,7 @@ from llama_index.core.llms import (
     LLMMetadata,
 )
 from llama_index.core.llms.callbacks import llm_completion_callback
-from pydantic import Field, model_validator
+from pydantic import Field
 
 from metagpt.config2 import Config
 from metagpt.llm import LLM
@@ -30,19 +30,30 @@ class RAGLLM(CustomLLM):
     num_output: int = -1
     model_name: str = ""
 
-    @model_validator(mode="after")
-    def update_from_config(self):
+    def __init__(
+        self,
+        model_infer: BaseLLM,
+        context_window: int = -1,
+        num_output: int = -1,
+        model_name: str = "",
+        *args,
+        **kwargs
+    ):
+        super().__init__(*args, **kwargs)
         config = Config.default()
-        if self.context_window < 0:
-            self.context_window = TOKEN_MAX.get(config.llm.model, DEFAULT_CONTEXT_WINDOW)
+        if context_window < 0:
+            context_window = TOKEN_MAX.get(config.llm.model, DEFAULT_CONTEXT_WINDOW)
 
-        if self.num_output < 0:
-            self.num_output = config.llm.max_token
+        if num_output < 0:
+            num_output = config.llm.max_token
 
-        if not self.model_name:
-            self.model_name = config.llm.model
+        if not model_name:
+            model_name = config.llm.model
 
-        return self
+        self.model_infer = model_infer
+        self.context_window = context_window
+        self.num_output = num_output
+        self.model_name = model_name
 
     @property
     def metadata(self) -> LLMMetadata:
diff --git a/tests/metagpt/exp_pool/test_decorator.py b/tests/metagpt/exp_pool/test_decorator.py
index 0ca4c6ce1..9d104fca4 100644
--- a/tests/metagpt/exp_pool/test_decorator.py
+++ b/tests/metagpt/exp_pool/test_decorator.py
@@ -155,7 +155,10 @@ class TestExpCache:
 
     @pytest.fixture
     def mock_config(self, mocker):
-        return mocker.patch("metagpt.exp_pool.decorator.config")
+        config = Config.default().model_copy(deep=True)
+        default = mocker.patch("metagpt.config2.Config.default")
+        default.return_value = config
+        return config
 
     @pytest.mark.asyncio
     async def test_exp_cache_disabled(self, mock_config, mock_exp_manager):
@@ -171,7 +174,9 @@ class TestExpCache:
 
     @pytest.mark.asyncio
     async def test_exp_cache_enabled_no_perfect_exp(self, mock_config, mock_exp_manager, mock_scorer):
+        mock_config.exp_pool.enabled = True
         mock_config.exp_pool.enable_read = True
+        mock_config.exp_pool.enable_write = True
         mock_exp_manager.query_exps.return_value = []
 
         @exp_cache(manager=mock_exp_manager, scorer=mock_scorer)
@@ -185,6 +190,7 @@ class TestExpCache:
 
     @pytest.mark.asyncio
     async def test_exp_cache_enabled_with_perfect_exp(self, mock_config, mock_exp_manager, mock_perfect_judge):
+        mock_config.exp_pool.enabled = True
         mock_config.exp_pool.enable_read = True
         perfect_exp = Experience(req="test", resp="perfect_result")
         mock_exp_manager.query_exps.return_value = [perfect_exp]