diff --git a/src/memos/api/handlers/chat_handler.py b/src/memos/api/handlers/chat_handler.py
index c42157245..b0240985e 100644
--- a/src/memos/api/handlers/chat_handler.py
+++ b/src/memos/api/handlers/chat_handler.py
@@ -688,14 +688,24 @@ def generate_chat_response() -> Generator[str, None, None]:
     def _dedup_and_supplement_memories(
         self, first_filtered_memories: list, second_filtered_memories: list
     ) -> list:
-        """Remove memory from second_filtered_memories that already exists in first_filtered_memories, return remaining memories"""
-        # Create a set of IDs from first_filtered_memories for efficient lookup
-        first_memory_ids = {memory["id"] for memory in first_filtered_memories}
+        """
+        Remove memories from second_filtered_memories whose content already exists in
+        first_filtered_memories, return the remaining list.
+        """
+
+        def _norm(text: str) -> str:
+            # Use normalized text as the dedup key; keep original text in the payload.
+            return " ".join(text.split())
+
+        first_memory_texts = {_norm(memory.get("memory", "")) for memory in first_filtered_memories}
 
         remaining_memories = []
         for memory in second_filtered_memories:
-            if memory["id"] not in first_memory_ids:
-                remaining_memories.append(memory)
+            key = _norm(memory.get("memory", ""))
+            if key in first_memory_texts:
+                continue
+            first_memory_texts.add(key)
+            remaining_memories.append(memory)
         return remaining_memories
 
     def _get_internet_reference(
diff --git a/src/memos/multi_mem_cube/single_cube.py b/src/memos/multi_mem_cube/single_cube.py
index a36f4ff3a..57f2cdba1 100644
--- a/src/memos/multi_mem_cube/single_cube.py
+++ b/src/memos/multi_mem_cube/single_cube.py
@@ -360,7 +360,20 @@ def _fine_search(
             logger.info(
                 f"Added {len(additional_memories)} more memories. Total enhanced memories: {len(enhanced_memories)}"
             )
-        formatted_memories = [format_memory_item(data) for data in enhanced_memories]
+
+        def _dedup_by_content(memories: list) -> list:
+            seen = set()
+            unique_memories = []
+            for mem in memories:
+                key = " ".join(mem.memory.split())
+                if key in seen:
+                    continue
+                seen.add(key)
+                unique_memories.append(mem)
+            return unique_memories
+
+        deduped_memories = _dedup_by_content(enhanced_memories)
+        formatted_memories = [format_memory_item(data) for data in deduped_memories]
 
         logger.info(f"Found {len(formatted_memories)} memories for user {search_req.user_id}")