diff --git a/app/utils/milvus_utils.py b/app/utils/milvus_utils.py
index 9ba67bf..d7c7017 100644
--- a/app/utils/milvus_utils.py
+++ b/app/utils/milvus_utils.py
@@ -1,5 +1,5 @@
 import asyncio
-from typing import List, Optional
+from typing import List, Optional, Union
 
 from langchain_core.output_parsers import StrOutputParser
 from langchain_core.prompts import ChatPromptTemplate
@@ -15,7 +15,7 @@ from app.utils.nltk_utils import load_nltk
 
 class KnowledgeQueryParam(BaseModel):
   question: str = Field(..., description="问题文本")
-  kb_code: str = Field(..., description="知识库编码")
+  kb_code: Union[str, List[str]] = Field(..., description="知识库编码")
   top_k: int = Field(default=5, description="返回结果数量")
 
 
@@ -90,7 +90,7 @@ class MilvusService:
       embed_model=self.embeddings,
     )
 
-    filters = MetadataFilters(filters=[MetadataFilter(key="parent_code", value=param.kb_code, operator=FilterOperator.EQ)])
+    filters = MetadataFilters(filters=[MetadataFilter(key="parent_code", value=param.kb_code, operator=FilterOperator.IN if isinstance(param.kb_code, list) else FilterOperator.EQ)])
 
     retriever = vector_index.as_retriever(filters=filters, similarity_top_k=param.top_k)