diff --git a/metagpt/tools/libs/index_repo.py b/metagpt/tools/libs/index_repo.py
index f0c7cba9d..a5d9fc6aa 100644
--- a/metagpt/tools/libs/index_repo.py
+++ b/metagpt/tools/libs/index_repo.py
@@ -109,8 +109,10 @@ class IndexRepo(BaseModel):
                 continue
             filter_filenames.add(str(i))
         if new_files:
-            await self.add(paths=list(new_files.keys()), file_datas=new_files)
-            filter_filenames.update([str(i) for i in new_files.keys()])
+            added, others = await self.add(paths=list(new_files.keys()), file_datas=new_files)
+            filter_filenames.update([str(i) for i in added])
+            for i in others:
+                result.append(TextScore(filename=str(i), text=new_files.get(i)))
         nodes = await self._search(query=query, filters=filter_filenames)
         return result + nodes
 
@@ -146,12 +148,19 @@ class IndexRepo(BaseModel):
         scores.sort(key=lambda x: x[0], reverse=True)
         return [i[1] for i in scores][: self.recall_count]
 
-    async def add(self, paths: List[Path], file_datas: Dict[Union[str, Path], str] = None):
+    async def add(
+        self, paths: List[Path], file_datas: Dict[Union[str, Path], str] = None
+    ) -> Tuple[List[str], List[str]]:
         """Add new documents to the index.
 
         Args:
             paths (List[Path]): A list of paths to the documents to be added.
             file_datas (Dict[Union[str, Path], str]): A list of file content.
+
+        Returns:
+        Tuple[List[str], List[str]]: A tuple containing two lists:
+            1. The list of filenames that were successfully added to the index.
+            2. The list of filenames that were not added to the index because they were not buildable.
         """
         encoding = tiktoken.get_encoding("cl100k_base")
         filenames, _ = await self._filter(paths)
@@ -170,6 +179,7 @@ class IndexRepo(BaseModel):
                 delete_filenames.append(i)
                 logger.debug(f"{i} not is_buildable: {token_count}, {self.min_token_count}~{self.max_token_count}")
         await self._add_batch(filenames=filter_filenames, delete_filenames=delete_filenames, file_datas=file_datas)
+        return filter_filenames, delete_filenames
 
     async def _add_batch(
         self,
diff --git a/tests/data/pdf/20210709逗你学云豆付费课程协议.pdf b/tests/data/pdf/20210709逗你学云豆付费课程协议.pdf
new file mode 100644
index 000000000..278ab2160
Binary files /dev/null and b/tests/data/pdf/20210709逗你学云豆付费课程协议.pdf differ
diff --git a/tests/metagpt/tools/libs/test_editor.py b/tests/metagpt/tools/libs/test_editor.py
index 6dbd6f274..24c368c7b 100644
--- a/tests/metagpt/tools/libs/test_editor.py
+++ b/tests/metagpt/tools/libs/test_editor.py
@@ -703,5 +703,28 @@ async def test_index_repo():
     shutil.rmtree(UPLOAD_ROOT)
 
 
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("query", "filename"),
+    [
+        (
+            "In this document, who are the legal representatives of both parties?",
+            TEST_DATA_PATH / "pdf/20210709逗你学云豆付费课程协议.pdf",
+        )
+    ],
+)
+async def test_similarity_search(query, filename):
+    filename = Path(filename)
+    save_to = Path(UPLOAD_ROOT) / filename.name
+    save_to.parent.mkdir(parents=True, exist_ok=True)
+    os.system(f"cp {str(filename)} {str(save_to)}")
+
+    editor = Editor()
+    rsp = await editor.similarity_search(query=query, file_or_path=save_to)
+    assert rsp
+
+    save_to.unlink(missing_ok=True)
+
+
 if __name__ == "__main__":
     pytest.main([__file__, "-s"])