diff --git a/examples/example.json b/examples/example.json
deleted file mode 100644
index 996cbec3b..000000000
--- a/examples/example.json
+++ /dev/null
@@ -1,10 +0,0 @@
-[
-    {
-        "source": "Which facial cleanser is good for oily skin?",
-        "output": "ABC cleanser is preferred by many with oily skin."
-    },
-    {
-        "source": "Is L'Oreal good to use?",
-        "output": "L'Oreal is a popular brand with many positive reviews."
-    }
-]
\ No newline at end of file
diff --git a/examples/example.xlsx b/examples/example.xlsx
deleted file mode 100644
index 85fda644e..000000000
Binary files a/examples/example.xlsx and /dev/null differ
diff --git a/examples/rag_pipeline.py b/examples/rag_pipeline.py
new file mode 100644
index 000000000..5b47cec62
--- /dev/null
+++ b/examples/rag_pipeline.py
@@ -0,0 +1,102 @@
+"""RAG pipeline"""
+import asyncio
+
+import faiss
+from llama_index import (
+    ServiceContext,
+    SimpleDirectoryReader,
+    StorageContext,
+    VectorStoreIndex,
+)
+from llama_index.postprocessor import LLMRerank
+from llama_index.retrievers import BM25Retriever, VectorIndexRetriever
+from llama_index.vector_stores.faiss import FaissVectorStore
+
+from metagpt.const import EXAMPLE_PATH
+from metagpt.rag.llm import get_default_llm
+from metagpt.rag.retrievers import SimpleHybridRetriever
+from metagpt.utils.embedding import get_embedding
+
+DOC_PATH = EXAMPLE_PATH / "data/rag.txt"
+QUESTION = "What are key qualities to be a good writer?"
+TOPK = 5
+
+
+def print_result(nodes, extra="retrieve"):
+    """print retrieve/rerank result"""
+    print("-" * 50)
+    print(f"{extra} result")
+    for i, node in enumerate(nodes):
+        print(f"{i}. {node.text[:10]}..., {node.score}")
+
+
+async def rag_pipeline():
+    """This example run rag pipeline, use faiss&bm25 retriever and llm ranker, will print something like:
+
+    --------------------------------------------------
+    faiss retrieve result
+    0. I highly r..., 0.3958844542503357
+    1. I wrote cu..., 0.41629382967948914
+    2. Productivi..., 0.4318419098854065
+    3. Some sort ..., 0.45991092920303345
+    --------------------------------------------------
+    bm25 retrieve result
+    0. I highly r..., 0.19445682103516615
+    1. Some sort ..., 0.18688966233196197
+    2. Productivi..., 0.17071309618829872
+    3. I wrote cu..., 0.15878996566615383
+    --------------------------------------------------
+    hybrid retrieve result
+    0. I highly r..., 0.3958844542503357
+    1. I wrote cu..., 0.41629382967948914
+    2. Productivi..., 0.4318419098854065
+    3. Some sort ..., 0.45991092920303345
+    --------------------------------------------------
+    llm ranker result
+    0. Productivi..., 10.0
+    1. I wrote cu..., 7.0
+    2. I highly r..., 5.0
+    """
+    # Documents, there are many readers can load documents.
+    documents = SimpleDirectoryReader(input_files=[DOC_PATH]).load_data()
+
+    # Service Conext, a bundle of resources for llm/embedding/node_parse.
+    service_context = ServiceContext.from_defaults(llm=get_default_llm(), embed_model=get_embedding())
+
+    # Nodes, chunks of documents.
+    node_parser = service_context.node_parser
+    nodes = node_parser.get_nodes_from_documents(documents)
+
+    # Index-FAISS
+    vector_store = FaissVectorStore(faiss_index=faiss.IndexFlatL2(1536))  # dimensions of text-ada-embedding-002
+    storage_context = StorageContext.from_defaults(vector_store=vector_store)
+    vector_index = VectorStoreIndex(nodes=nodes, storage_context=storage_context, service_context=service_context)
+
+    # Retriever-FAISS
+    faiss_retriever = VectorIndexRetriever(index=vector_index, similarity_top_k=TOPK)
+    faiss_retrieve_nodes = await faiss_retriever.aretrieve(QUESTION)
+    print_result(faiss_retrieve_nodes, extra="faiss retrieve")
+
+    # Retriever-BM25
+    bm25_retriever = BM25Retriever.from_defaults(nodes=nodes, similarity_top_k=TOPK)
+    bm25_retrieve_nodes = await bm25_retriever.aretrieve(QUESTION)
+    print_result(bm25_retrieve_nodes, extra="bm25 retrieve")
+
+    # Retriever-Hybrid
+    hybrid_retriever = SimpleHybridRetriever(faiss_retriever, bm25_retriever)
+    hybrid_retrieve_nodes = await hybrid_retriever.aretrieve(QUESTION)
+    print_result(hybrid_retrieve_nodes, extra="hybrid retrieve")
+
+    # Ranker-LLM
+    llm_ranker = LLMRerank(top_n=TOPK, service_context=service_context)
+    llm_rank_nodes = llm_ranker.postprocess_nodes(faiss_retrieve_nodes, query_str=QUESTION)
+    print_result(llm_rank_nodes, extra="llm ranker")
+
+
+async def main():
+    """RAG pipeline"""
+    await rag_pipeline()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/examples/rag_search.py b/examples/rag_search.py
new file mode 100644
index 000000000..222573476
--- /dev/null
+++ b/examples/rag_search.py
@@ -0,0 +1,19 @@
+"""Agent with RAG search"""
+import asyncio
+
+from examples.rag_pipeline import DOC_PATH, QUESTION, TOPK
+from metagpt.logs import logger
+from metagpt.rag.engines import SimpleEngine
+from metagpt.roles import Sales
+
+
+async def search():
+    """Agent with RAG search"""
+    store = SimpleEngine.from_docs(input_files=[DOC_PATH], similarity_top_k=TOPK)
+    role = Sales(profile="Sales", store=store)
+    result = await role.run(QUESTION)
+    logger.info(result)
+
+
+if __name__ == "__main__":
+    asyncio.run(search())
diff --git a/metagpt/rag/__init__.py b/metagpt/rag/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/metagpt/rag/engines/__init__.py b/metagpt/rag/engines/__init__.py
new file mode 100644
index 000000000..7b4e37e88
--- /dev/null
+++ b/metagpt/rag/engines/__init__.py
@@ -0,0 +1,3 @@
+from metagpt.rag.engines.simple import SimpleEngine
+
+__all__ = ["SimpleEngine"]
diff --git a/metagpt/rag/engines/simple.py b/metagpt/rag/engines/simple.py
new file mode 100644
index 000000000..7532f6620
--- /dev/null
+++ b/metagpt/rag/engines/simple.py
@@ -0,0 +1,48 @@
+"""Simple Engine."""
+from typing import Optional
+
+from llama_index import ServiceContext, SimpleDirectoryReader, VectorStoreIndex
+from llama_index.constants import DEFAULT_SIMILARITY_TOP_K
+from llama_index.embeddings.base import BaseEmbedding
+from llama_index.llms.llm import LLM
+from llama_index.query_engine import RetrieverQueryEngine
+from llama_index.retrievers import VectorIndexRetriever
+
+from metagpt.rag.llm import get_default_llm
+from metagpt.utils.embedding import get_embedding
+
+
+class SimpleEngine(RetrieverQueryEngine):
+    """
+    SimpleEngine is a search engine that uses a vector index for retrieving documents.
+    """
+
+    @classmethod
+    def from_docs(
+        cls,
+        input_dir: str = None,
+        input_files: list = None,
+        embed_model: BaseEmbedding = None,
+        llm: LLM = None,
+        # node parser kwargs
+        chunk_size: Optional[int] = None,
+        chunk_overlap: Optional[int] = None,
+        # retrieve kwargs
+        similarity_top_k: int = DEFAULT_SIMILARITY_TOP_K,
+    ) -> "SimpleEngine":
+        """This engine is designed to be simple and straightforward"""
+        documents = SimpleDirectoryReader(input_dir=input_dir, input_files=input_files).load_data()
+        service_context = ServiceContext.from_defaults(
+            embed_model=embed_model or get_embedding(),
+            chunk_size=chunk_size,
+            chunk_overlap=chunk_overlap,
+            llm=llm or get_default_llm(),
+        )
+        index = VectorStoreIndex.from_documents(documents, service_context=service_context)
+        retriever = VectorIndexRetriever(index=index, similarity_top_k=similarity_top_k)
+
+        return SimpleEngine(retriever=retriever)
+
+    async def asearch(self, content: str, **kwargs) -> str:
+        """Inplement tools.SearchInterface"""
+        return await self.aquery(content)
diff --git a/metagpt/rag/llm.py b/metagpt/rag/llm.py
new file mode 100644
index 000000000..e67be1416
--- /dev/null
+++ b/metagpt/rag/llm.py
@@ -0,0 +1,7 @@
+from llama_index.llms import OpenAI
+
+from metagpt.config2 import config
+
+
+def get_default_llm() -> OpenAI:
+    return OpenAI(api_base=config.llm.base_url, api_key=config.llm.api_key)
diff --git a/metagpt/rag/rankers/__init__.py b/metagpt/rag/rankers/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/metagpt/rag/rankers/base.py b/metagpt/rag/rankers/base.py
new file mode 100644
index 000000000..482fc4aef
--- /dev/null
+++ b/metagpt/rag/rankers/base.py
@@ -0,0 +1,20 @@
+"""Base Ranker."""
+
+from abc import abstractmethod
+from typing import Optional
+
+from llama_index import QueryBundle
+from llama_index.postprocessor.types import BaseNodePostprocessor
+from llama_index.schema import NodeWithScore
+
+
+class RAGRanker(BaseNodePostprocessor):
+    """inherit from llama_index"""
+
+    @abstractmethod
+    def _postprocess_nodes(
+        self,
+        nodes: list[NodeWithScore],
+        query_bundle: Optional[QueryBundle] = None,
+    ) -> list[NodeWithScore]:
+        """postprocess nodes."""
diff --git a/metagpt/rag/retrievers/__init__.py b/metagpt/rag/retrievers/__init__.py
new file mode 100644
index 000000000..799766870
--- /dev/null
+++ b/metagpt/rag/retrievers/__init__.py
@@ -0,0 +1,4 @@
+"""init"""
+from metagpt.rag.retrievers.hybrid import SimpleHybridRetriever
+
+__all__ = ["SimpleHybridRetriever"]
diff --git a/metagpt/rag/retrievers/base.py b/metagpt/rag/retrievers/base.py
new file mode 100644
index 000000000..c0291f217
--- /dev/null
+++ b/metagpt/rag/retrievers/base.py
@@ -0,0 +1,18 @@
+"""Base retriever."""
+
+
+from abc import abstractmethod
+
+from llama_index.retrievers import BaseRetriever
+from llama_index.schema import NodeWithScore, QueryType
+
+
+class RAGRetriever(BaseRetriever):
+    """inherit from llama_index"""
+
+    @abstractmethod
+    async def _aretrieve(self, query: QueryType) -> list[NodeWithScore]:
+        """retrieve nodes"""
+
+    def _retrieve(self, query: QueryType) -> list[NodeWithScore]:
+        """retrieve nodes"""
diff --git a/metagpt/rag/retrievers/hybrid.py b/metagpt/rag/retrievers/hybrid.py
new file mode 100644
index 000000000..e6b526b38
--- /dev/null
+++ b/metagpt/rag/retrievers/hybrid.py
@@ -0,0 +1,36 @@
+"""Hybrid retriever."""
+from llama_index.schema import QueryType
+
+from metagpt.rag.retrievers.base import RAGRetriever
+
+
+class SimpleHybridRetriever(RAGRetriever):
+    """
+    SimpleHybridRetriever is a composite retriever that aggregates search results from multiple retrievers.
+    """
+
+    def __init__(self, *retrievers):
+        self.retrievers: list[RAGRetriever] = retrievers
+        super().__init__()
+
+    async def _aretrieve(self, query: QueryType, **kwargs):
+        """
+        Asynchronously retrieves and aggregates search results from all configured retrievers.
+
+        This method queries each retriever in the `retrievers` list with the given query and
+        additional keyword arguments. It then combines the results, ensuring that each node is
+        unique, based on the node's ID.
+        """
+        all_nodes = []
+        for retriever in self.retrievers:
+            nodes = await retriever.aretrieve(query, **kwargs)
+            all_nodes.extend(nodes)
+
+        # combine all nodes
+        result = []
+        node_ids = set()
+        for n in all_nodes:
+            if n.node.node_id not in node_ids:
+                result.append(n)
+                node_ids.add(n.node.node_id)
+        return result
diff --git a/metagpt/roles/sales.py b/metagpt/roles/sales.py
index bc449b5cd..e5cb12778 100644
--- a/metagpt/roles/sales.py
+++ b/metagpt/roles/sales.py
@@ -11,7 +11,6 @@ from typing import Optional
 from pydantic import Field, model_validator
 
 from metagpt.actions import SearchAndSummarize, UserRequirement
-from metagpt.document_store.base_store import BaseStore
 from metagpt.roles import Role
 from metagpt.tools.search_engine import SearchEngine
 
@@ -27,7 +26,7 @@ class Sales(Role):
         "delivered with the professionalism and courtesy expected of a seasoned sales guide."
     )
 
-    store: Optional[BaseStore] = Field(default=None, exclude=True)
+    store: Optional[object] = Field(default=None, exclude=True)  # must inplement tools.SearchInterface
 
     @model_validator(mode="after")
     def validate_stroe(self):
diff --git a/metagpt/tools/__init__.py b/metagpt/tools/__init__.py
index c1f604df9..8d265e9f3 100644
--- a/metagpt/tools/__init__.py
+++ b/metagpt/tools/__init__.py
@@ -30,3 +30,8 @@ class WebBrowserEngineType(Enum):
     def __missing__(cls, key):
         """Default type conversion"""
         return cls.CUSTOM
+
+
+class SearchInterface:
+    async def asearch(self, *args, **kwargs):
+        ...
diff --git a/tests/metagpt/document_store/test_faiss_store.py b/tests/metagpt/document_store/test_faiss_store.py
index 1a159b413..0c5a55e0f 100644
--- a/tests/metagpt/document_store/test_faiss_store.py
+++ b/tests/metagpt/document_store/test_faiss_store.py
@@ -28,7 +28,7 @@ def mock_openai_embed_documents(self, texts: list[str], chunk_size: Optional[int
 async def test_search_json(mocker):
     mocker.patch("langchain_community.embeddings.openai.OpenAIEmbeddings.embed_documents", mock_openai_embed_documents)
 
-    store = FaissStore(EXAMPLE_PATH / "example.json")
+    store = FaissStore(EXAMPLE_PATH / "data/example.json")
     role = Sales(profile="Sales", store=store)
     query = "Which facial cleanser is good for oily skin?"
     result = await role.run(query)
@@ -39,7 +39,7 @@ async def test_search_json(mocker):
 async def test_search_xlsx(mocker):
     mocker.patch("langchain_community.embeddings.openai.OpenAIEmbeddings.embed_documents", mock_openai_embed_documents)
 
-    store = FaissStore(EXAMPLE_PATH / "example.xlsx")
+    store = FaissStore(EXAMPLE_PATH / "data/example.xlsx")
     role = Sales(profile="Sales", store=store)
     query = "Which facial cleanser is good for oily skin?"
     result = await role.run(query)
@@ -50,7 +50,7 @@ async def test_search_xlsx(mocker):
 async def test_write(mocker):
     mocker.patch("langchain_community.embeddings.openai.OpenAIEmbeddings.embed_documents", mock_openai_embed_documents)
 
-    store = FaissStore(EXAMPLE_PATH / "example.xlsx", meta_col="Answer", content_col="Question")
+    store = FaissStore(EXAMPLE_PATH / "data/example.xlsx", meta_col="Answer", content_col="Question")
     _faiss_store = store.write()
     assert _faiss_store.storage_context.docstore
     assert _faiss_store.storage_context.vector_store.client
diff --git a/tests/metagpt/rag/engine/test_simple.py b/tests/metagpt/rag/engine/test_simple.py
new file mode 100644
index 000000000..4eb1d0b6d
--- /dev/null
+++ b/tests/metagpt/rag/engine/test_simple.py
@@ -0,0 +1,67 @@
+from unittest.mock import AsyncMock
+
+import pytest
+
+from metagpt.rag import SimpleEngine
+
+
+class TestSimpleEngineFromDocs:
+    def test_from_docs(self, mocker):
+        # Mock dependencies
+        mock_simple_directory_reader = mocker.patch("metagpt.rag.engines.simple.SimpleDirectoryReader")
+        mock_simple_directory_reader.return_value.load_data.return_value = ["document1", "document2"]
+
+        mock_service_context = mocker.patch("metagpt.rag.engines.simple.ServiceContext.from_defaults")
+        mock_vector_store_index = mocker.patch("metagpt.rag.engines.simple.VectorStoreIndex.from_documents")
+        mock_vector_index_retriever = mocker.patch("metagpt.rag.engines.simple.VectorIndexRetriever")
+
+        # Setup
+        input_dir = "test_dir"
+        input_files = ["test_file1", "test_file2"]
+        embed_model = mocker.MagicMock()
+        llm = mocker.MagicMock()
+        chunk_size = 100
+        chunk_overlap = 10
+        similarity_top_k = 5
+
+        # Execute
+        engine = SimpleEngine.from_docs(
+            input_dir=input_dir,
+            input_files=input_files,
+            embed_model=embed_model,
+            llm=llm,
+            chunk_size=chunk_size,
+            chunk_overlap=chunk_overlap,
+            similarity_top_k=similarity_top_k,
+        )
+
+        # Assertions
+        mock_simple_directory_reader.assert_called_once_with(input_dir=input_dir, input_files=input_files)
+        mock_service_context.assert_called_once_with(
+            embed_model=embed_model, chunk_size=chunk_size, chunk_overlap=chunk_overlap, llm=llm
+        )
+        mock_vector_store_index.assert_called_once_with(
+            ["document1", "document2"], service_context=mock_service_context.return_value
+        )
+        mock_vector_index_retriever.assert_called_once_with(
+            index=mock_vector_store_index.return_value, similarity_top_k=similarity_top_k
+        )
+        assert isinstance(engine, SimpleEngine)
+
+    @pytest.mark.asyncio
+    async def test_asearch_calls_aquery(self, mocker):
+        # Mock
+        test_query = "test query"
+        expected_result = "expected result"
+        mock_aquery = AsyncMock(return_value=expected_result)
+
+        # Setup
+        engine = SimpleEngine(retriever=mocker.MagicMock())
+        engine.aquery = mock_aquery
+
+        # Execute
+        result = await engine.asearch(test_query)
+
+        # Assertions
+        mock_aquery.assert_called_once_with(test_query)
+        assert result == expected_result
diff --git a/tests/metagpt/rag/retrievers/test_hybrid_retriever.py b/tests/metagpt/rag/retrievers/test_hybrid_retriever.py
new file mode 100644
index 000000000..62d976ba2
--- /dev/null
+++ b/tests/metagpt/rag/retrievers/test_hybrid_retriever.py
@@ -0,0 +1,39 @@
+from unittest.mock import AsyncMock
+
+import pytest
+from llama_index.schema import NodeWithScore, TextNode
+
+from metagpt.rag.retrievers import SimpleHybridRetriever
+
+
+class TestSimpleHybridRetriever:
+    @pytest.mark.asyncio
+    async def test_aretrieve(self):
+        question = "test query"
+
+        # Create mock retrievers
+        mock_retriever1 = AsyncMock()
+        mock_retriever1.aretrieve.return_value = [
+            NodeWithScore(node=TextNode(id_="1"), score=1.0),
+            NodeWithScore(node=TextNode(id_="2"), score=0.95),
+        ]
+
+        mock_retriever2 = AsyncMock()
+        mock_retriever2.aretrieve.return_value = [
+            NodeWithScore(node=TextNode(id_="2"), score=0.95),
+            NodeWithScore(node=TextNode(id_="3"), score=0.8),
+        ]
+
+        # Instantiate the SimpleHybridRetriever with the mock retrievers
+        hybrid_retriever = SimpleHybridRetriever(mock_retriever1, mock_retriever2)
+
+        # Call the _aretrieve method
+        results = await hybrid_retriever._aretrieve(question)
+
+        # Check if the results are as expected
+        assert len(results) == 3  # Should be 3 unique nodes
+        assert set(node.node.node_id for node in results) == {"1", "2", "3"}
+
+        # Check if the scores are correct (assuming you want the highest score)
+        node_scores = {node.node.node_id: node.score for node in results}
+        assert node_scores["2"] == 0.95