diff --git a/rag/utils/infinity_conn.py b/rag/utils/infinity_conn.py
index 7d2107700..aa18d044b 100644
--- a/rag/utils/infinity_conn.py
+++ b/rag/utils/infinity_conn.py
@@ -147,6 +147,9 @@ class InfinityConnection(InfinityConnectionBase):
         filter_cond = None
         filter_fulltext = ""
         if condition:
+            # Remove kb_id filter for Infinity (it uses table separation instead)
+            condition = {k: v for k, v in condition.items() if k != "kb_id"}
+
             table_found = False
             for indexName in index_names:
                 if indexName.startswith("ragflow_doc_meta_"):