diff --git a/.gitignore b/.gitignore
index 1613a638d..2c59f3b59 100644
--- a/.gitignore
+++ b/.gitignore
@@ -171,3 +171,4 @@ tests/metagpt/utils/file_repo_git
 *.png
 htmlcov
 htmlcov.*
+*.pkl
diff --git a/examples/faq.xlsx b/examples/example.xlsx
similarity index 100%
rename from examples/faq.xlsx
rename to examples/example.xlsx
diff --git a/metagpt/document.py b/metagpt/document.py
index dcbd19d4d..f4fa0a489 100644
--- a/metagpt/document.py
+++ b/metagpt/document.py
@@ -101,6 +101,7 @@ class Document(BaseModel):
             raise ValueError("File path is not set.")
 
         self.path.parent.mkdir(parents=True, exist_ok=True)
+        # TODO: excel, csv, json, etc.
         self.path.write_text(self.content, encoding="utf-8")
 
     def persist(self):
@@ -126,10 +127,12 @@ class IndexableDocument(Document):
         if not data_path.exists():
             raise FileNotFoundError(f"File {data_path} not found.")
         data = read_data(data_path)
-        content = data_path.read_text()
         if isinstance(data, pd.DataFrame):
             validate_cols(content_col, data)
-        return cls(data=data, content=content, content_col=content_col, meta_col=meta_col)
+            return cls(data=data, content=str(data), content_col=content_col, meta_col=meta_col)
+        else:
+            content = data_path.read_text()
+            return cls(data=data, content=content, content_col=content_col, meta_col=meta_col)
 
     def _get_docs_and_metadatas_by_df(self) -> (list, list):
         df = self.data
diff --git a/metagpt/document_store/faiss_store.py b/metagpt/document_store/faiss_store.py
index bfba1d386..1271f1c23 100644
--- a/metagpt/document_store/faiss_store.py
+++ b/metagpt/document_store/faiss_store.py
@@ -14,7 +14,6 @@ from langchain.vectorstores import FAISS
 from langchain_core.embeddings import Embeddings
 
 from metagpt.config import CONFIG
-from metagpt.const import DATA_PATH
 from metagpt.document import IndexableDocument
 from metagpt.document_store.base_store import LocalStore
 from metagpt.logs import logger
@@ -76,10 +75,3 @@ class FaissStore(LocalStore):
     def delete(self, *args, **kwargs):
         """Currently, langchain does not provide a delete interface."""
         raise NotImplementedError
-
-
-if __name__ == "__main__":
-    faiss_store = FaissStore(DATA_PATH / "qcs/qcs_4w.json")
-    logger.info(faiss_store.search("Oily Skin Facial Cleanser"))
-    faiss_store.add([f"Oily Skin Facial Cleanser-{i}" for i in range(3)])
-    logger.info(faiss_store.search("Oily Skin Facial Cleanser"))
diff --git a/tests/metagpt/document_store/test_faiss_store.py b/tests/metagpt/document_store/test_faiss_store.py
index 75bb5427f..7e2979bd4 100644
--- a/tests/metagpt/document_store/test_faiss_store.py
+++ b/tests/metagpt/document_store/test_faiss_store.py
@@ -30,3 +30,11 @@ async def test_search_xlsx():
     query = "Which facial cleanser is good for oily skin?"
     result = await role.run(query)
     logger.info(result)
+
+
+@pytest.mark.asyncio
+async def test_write():
+    store = FaissStore(EXAMPLE_PATH / "example.xlsx", meta_col="Answer", content_col="Question")
+    _faiss_store = store.write()
+    assert _faiss_store.docstore
+    assert _faiss_store.index