diff --git a/lightrag/operate.py b/lightrag/operate.py
index b1b803db..2a64a791 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -613,11 +613,13 @@ async def extract_entities(
                 glean_result, chunk_key, file_path
             )
 
-            # Merge results
+            # Merge results - only add entities and edges with new names
             for entity_name, entities in glean_nodes.items():
-                maybe_nodes[entity_name].extend(entities)
+                if entity_name not in maybe_nodes:  # Only accetp entities with new name in gleaning stage
+                    maybe_nodes[entity_name].extend(entities)
             for edge_key, edges in glean_edges.items():
-                maybe_edges[edge_key].extend(edges)
+                if edge_key not in maybe_edges:  # Only accetp edges with new name in gleaning stage
+                    maybe_edges[edge_key].extend(edges)
 
             if now_glean_index == entity_extract_max_gleaning - 1:
                 break