diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/KingdeeAttachmentSyncSupport.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/KingdeeAttachmentSyncSupport.java
index 9fd2616f..dd20ddde 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/KingdeeAttachmentSyncSupport.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/KingdeeAttachmentSyncSupport.java
@@ -179,7 +179,10 @@ public class KingdeeAttachmentSyncSupport {
 			if (record.getId() == null) {
 				attachmentSyncMapper.insert(record);
 			} else {
-				attachmentSyncMapper.updateById(record);
+				// updateById 默认忽略 null 字段，失败转成功时 fail_reason 须显式置空，避免残留历史失败原因
+				attachmentSyncMapper.update(record, Wrappers.<KingdeeAttachmentSync>lambdaUpdate()
+					.eq(KingdeeAttachmentSync::getId, record.getId())
+					.set(KingdeeAttachmentSync::getFailReason, record.getFailReason()));
 			}
 		}
 		int total = success + failReasons.size();