diff --git a/api/app/core/memory/storage_services/forgetting_engine/access_history_manager.py b/api/app/core/memory/storage_services/forgetting_engine/access_history_manager.py
index acc2a717..729a5542 100644
--- a/api/app/core/memory/storage_services/forgetting_engine/access_history_manager.py
+++ b/api/app/core/memory/storage_services/forgetting_engine/access_history_manager.py
@@ -246,7 +246,7 @@ class AccessHistoryManager:
         if not node_data:
             return ConsistencyCheckResult.CONSISTENT, None
         
-        access_history = node_data.get('access_history', [])
+        access_history = node_data.get('access_history') or []
         last_access_time = node_data.get('last_access_time')
         access_count = node_data.get('access_count', 0)
         activation_value = node_data.get('activation_value')
@@ -409,7 +409,7 @@ class AccessHistoryManager:
                 logger.error(f"节点不存在，无法修复: {node_label}[{node_id}]")
                 return False
             
-            access_history = node_data.get('access_history', [])
+            access_history = node_data.get('access_history') or []
             importance_score = node_data.get('importance_score', 0.5)
             
             # 准备修复数据
@@ -530,7 +530,7 @@ class AccessHistoryManager:
         Returns:
             Dict[str, Any]: 更新数据，包含所有需要更新的字段
         """
-        access_history = node_data.get('access_history', [])
+        access_history = node_data.get('access_history') or []
         importance_score = node_data.get('importance_score', 0.5)
         
         # 追加新的访问时间
diff --git a/api/app/repositories/neo4j/cypher_queries.py b/api/app/repositories/neo4j/cypher_queries.py
index 259b1325..ed8f6100 100644
--- a/api/app/repositories/neo4j/cypher_queries.py
+++ b/api/app/repositories/neo4j/cypher_queries.py
@@ -722,7 +722,12 @@ SET m += {
     chunk_ids: summary.chunk_ids,
     content: summary.content,
     summary_embedding: summary.summary_embedding,
-    config_id: summary.config_id
+    config_id: summary.config_id,
+    importance_score: CASE WHEN summary.importance_score IS NOT NULL THEN summary.importance_score ELSE coalesce(m.importance_score, 0.5) END,
+    activation_value: CASE WHEN summary.activation_value IS NOT NULL THEN summary.activation_value ELSE m.activation_value END,
+    access_history: CASE WHEN summary.access_history IS NOT NULL THEN summary.access_history ELSE coalesce(m.access_history, []) END,
+    last_access_time: CASE WHEN summary.last_access_time IS NOT NULL THEN summary.last_access_time ELSE m.last_access_time END,
+    access_count: CASE WHEN summary.access_count IS NOT NULL THEN summary.access_count ELSE coalesce(m.access_count, 0) END
 }
 RETURN m.id AS uuid
 """
diff --git a/api/app/repositories/neo4j/entity_repository.py b/api/app/repositories/neo4j/entity_repository.py
index cb18feca..f4ca35c8 100644
--- a/api/app/repositories/neo4j/entity_repository.py
+++ b/api/app/repositories/neo4j/entity_repository.py
@@ -58,7 +58,7 @@ class EntityRepository(BaseNeo4jRepository[ExtractedEntityNode]):
         # 处理 ACT-R 属性 - 确保字段存在且有默认值
         n['importance_score'] = n.get('importance_score', 0.5)
         n['activation_value'] = n.get('activation_value')
-        n['access_history'] = n.get('access_history', [])
+        n['access_history'] = n.get('access_history') or []
         n['last_access_time'] = n.get('last_access_time')
         n['access_count'] = n.get('access_count', 0)
         
diff --git a/api/app/repositories/neo4j/statement_repository.py b/api/app/repositories/neo4j/statement_repository.py
index 22343e10..cd9f2fac 100644
--- a/api/app/repositories/neo4j/statement_repository.py
+++ b/api/app/repositories/neo4j/statement_repository.py
@@ -78,7 +78,7 @@ class StatementRepository(BaseNeo4jRepository[StatementNode]):
         # 处理 ACT-R 属性 - 确保字段存在且有默认值
         n['importance_score'] = n.get('importance_score', 0.5)
         n['activation_value'] = n.get('activation_value')
-        n['access_history'] = n.get('access_history', [])
+        n['access_history'] = n.get('access_history') or []
         n['last_access_time'] = n.get('last_access_time')
         n['access_count'] = n.get('access_count', 0)