diff --git a/src/knowledge/base.py b/src/knowledge/base.py
index f39d5915..83e747cc 100644
--- a/src/knowledge/base.py
+++ b/src/knowledge/base.py
@@ -404,7 +404,7 @@ class KnowledgeBase(ABC):
         # 从 kwargs 中获取 is_private 配置
         is_private = kwargs.get("is_private", False)
         prefix = "kb_private_" if is_private else "kb_"
-        db_id = f"{prefix}{hashstr(database_name, with_salt=True)}"
+        db_id = f"{prefix}{hashstr(database_name, with_salt=True, length=32)}"
 
         # 创建数据库记录
         # 确保 Pydantic 模型被转换为字典，以便 JSON 序列化