diff --git a/src/memos/mem_reader/multi_modal_struct.py b/src/memos/mem_reader/multi_modal_struct.py
index f6a016556..ce75f6dc5 100644
--- a/src/memos/mem_reader/multi_modal_struct.py
+++ b/src/memos/mem_reader/multi_modal_struct.py
@@ -108,10 +108,10 @@ def _create_chunk_item(chunk):
                 )
                 return split_item
 
-            # Use thread pool to parallel process chunks
+            # Use thread pool to parallel process chunks, but keep the original order
             with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
                 futures = [executor.submit(_create_chunk_item, chunk) for chunk in chunks]
-                for future in concurrent.futures.as_completed(futures):
+                for future in futures:
                     split_item = future.result()
                     if split_item is not None:
                         split_items.append(split_item)
@@ -146,26 +146,33 @@ def _concat_multi_modal_memories(
         parallel_chunking = True
 
         if parallel_chunking:
-            # parallel chunk large memory items
+            # parallel chunk large memory items, but keep the original order
             with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
-                future_to_item = {
-                    executor.submit(self._split_large_memory_item, item, max_tokens): item
-                    for item in all_memory_items
-                    if (item.memory or "") and self._count_tokens(item.memory) > max_tokens
-                }
-                processed_items.extend(
-                    [
-                        item
-                        for item in all_memory_items
-                        if not (
-                            (item.memory or "") and self._count_tokens(item.memory) > max_tokens
-                        )
-                    ]
-                )
-                # collect split items from futures
-                for future in concurrent.futures.as_completed(future_to_item):
-                    split_items = future.result()
-                    processed_items.extend(split_items)
+                # Create a list to hold futures with their original index
+                futures = []
+                for idx, item in enumerate(all_memory_items):
+                    if (item.memory or "") and self._count_tokens(item.memory) > max_tokens:
+                        future = executor.submit(self._split_large_memory_item, item, max_tokens)
+                        futures.append(
+                            (idx, future, True)
+                        )  # True indicates this item needs splitting
+                    else:
+                        futures.append((idx, item, False))  # False indicates no splitting needed
+
+                # Process results in original order
+                temp_results = [None] * len(all_memory_items)
+                for idx, future_or_item, needs_splitting in futures:
+                    if needs_splitting:
+                        # Wait for the future to complete and get the split items
+                        split_items = future_or_item.result()
+                        temp_results[idx] = split_items
+                    else:
+                        # No splitting needed, use the original item
+                        temp_results[idx] = [future_or_item]
+
+                # Flatten the results while preserving order
+                for items in temp_results:
+                    processed_items.extend(items)
         else:
             # serial chunk large memory items
             for item in all_memory_items:
@@ -831,8 +838,9 @@ def _process_multi_modal_data(
         if isinstance(scene_data_info, list):
             # Parse each message in the list
             all_memory_items = []
-            # Use thread pool to parse each message in parallel
+            # Use thread pool to parse each message in parallel, but keep the original order
             with ContextThreadPoolExecutor(max_workers=30) as executor:
+                # submit tasks and keep the original order
                 futures = [
                     executor.submit(
                         self.multi_modal_parser.parse,
@@ -844,7 +852,8 @@ def _process_multi_modal_data(
                     )
                     for msg in scene_data_info
                 ]
-                for future in concurrent.futures.as_completed(futures):
+                # collect results in original order
+                for future in futures:
                     try:
                         items = future.result()
                         all_memory_items.extend(items)