diff --git a/src/main/java/com/spring/modules/proofing/service/impl/ProofingInformationServiceImpl.java b/src/main/java/com/spring/modules/proofing/service/impl/ProofingInformationServiceImpl.java
index ae525fcb..9cf96de3 100644
--- a/src/main/java/com/spring/modules/proofing/service/impl/ProofingInformationServiceImpl.java
+++ b/src/main/java/com/spring/modules/proofing/service/impl/ProofingInformationServiceImpl.java
@@ -452,6 +452,16 @@ public class ProofingInformationServiceImpl extends ServiceImpl<ProofingInformat
     @Override
     @Transactional
     public void proofingInformationEditStatus(ProofingInformationVo data) {
+        // 幂等检查：仅草稿状态可下达，防止并发重复提交
+        ProofingInformationEntity current = baseMapper.selectOne(
+                new LambdaQueryWrapper<ProofingInformationEntity>()
+                        .eq(ProofingInformationEntity::getSite, data.getSite())
+                        .eq(ProofingInformationEntity::getProofingNo, data.getProofingNo())
+        );
+        if (current == null || !"草稿".equals(current.getProofingStatus())) {
+            throw new RuntimeException("该打样单已提交或状态异常，请勿重复下达!");
+        }
+
         UpdateWrapper<ProofingInformationEntity> updateInformationWrapper = new UpdateWrapper<>();
         updateInformationWrapper.eq("site", data.getSite());
         updateInformationWrapper.eq("proofing_no", data.getProofingNo());