diff --git a/dbgpt/storage/vector_store/milvus_store.py b/dbgpt/storage/vector_store/milvus_store.py
index 0d5616e03..c03ede6d0 100644
--- a/dbgpt/storage/vector_store/milvus_store.py
+++ b/dbgpt/storage/vector_store/milvus_store.py
@@ -450,7 +450,7 @@ def similar_search_with_scores(
                     metadata=doc.metadata,
                     content=doc.content,
                     score=score,
-                    chunk_id=id,
+                    chunk_id=str(id),
                 )
                 for doc, score, id in docs_and_scores
                 if score >= score_threshold