diff --git a/inventory-backend/app/services/bom_service.py b/inventory-backend/app/services/bom_service.py
index 8bd7802..61a20a6 100644
--- a/inventory-backend/app/services/bom_service.py
+++ b/inventory-backend/app/services/bom_service.py
@@ -143,7 +143,7 @@ class BomService:
 
     @staticmethod
     def save_bom(data):
-        """保存 BOM (支持多版本)"""
+        """保存 BOM (支持多版本)，新增跨版本内容查重"""
         bom_no = data.get('bom_no')
         version = data.get('version', 'V1.0')
         parent_id = data['parent_id']
@@ -157,6 +157,38 @@ class BomService:
             if child['child_id'] == parent_id:
                 raise ValueError('父件与子件不能是同一物料')
 
+        # ===== 跨版本内容查重 =====
+        # 将当前提交的 children 转换为可比较的集合 (child_id, dosage)
+        current_children_set = set()
+        for child in children:
+            # 用 (child_id, dosage) 元组表示，dosage 转为整数比较
+            dosage_val = int(child.get('dosage', 0)) if child.get('dosage') else 0
+            current_children_set.add((child['child_id'], dosage_val))
+
+        # 查询该 bom_no 下所有其他版本的子件配置
+        existing_versions = db.session.query(
+            BomTable.version,
+            BomTable.child_id,
+            BomTable.dosage
+        ).filter(
+            BomTable.bom_no == bom_no,
+            BomTable.version != version  # 排除当前正在保存的版本
+        ).all()
+
+        # 按版本分组，构建每个版本的子件集合
+        version_children = {}
+        for ver, child_id, dosage in existing_versions:
+            if ver not in version_children:
+                version_children[ver] = set()
+            dosage_val = int(dosage) if dosage else 0
+            version_children[ver].add((child_id, dosage_val))
+
+        # 比对每个版本
+        for ver, existing_set in version_children.items():
+            if current_children_set == existing_set:
+                raise ValueError(f'保存失败！当前子件配置与已有版本 {ver} 完全一致，请勿重复保存')
+
+        # ===== 执行保存 =====
         # 仅删除当前版本的旧记录
         BomTable.query.filter_by(bom_no=bom_no, version=version).delete()
 
diff --git a/inventory-web/src/views/bom/BomManage.vue b/inventory-web/src/views/bom/BomManage.vue
index 4b44476..9a209e8 100644
--- a/inventory-web/src/views/bom/BomManage.vue
+++ b/inventory-web/src/views/bom/BomManage.vue
@@ -224,6 +224,7 @@ const isEditMode = ref(false)
 const isSaveAsMode = ref(false)  // 任务1：标记是否为另存为模式
 let originalVersion = ''  // 保存原始版本号用于计算升级选项
 let currentBomNo = ''  // 保存当前操作的 BOM 编号用于计算版本避让
+let originalChildren: ChildRow[] = []  // 保存原始子件数据用于本地查重
 
 const bomList = ref<BomItem[]>([])
 const materialOptions = ref<MaterialBase[]>([])
@@ -441,6 +442,8 @@ const handleSaveAs = async (row: BomItem) => {
   // 保存原始版本号和 BOM 编号用于计算升级选项
   originalVersion = form.version
   currentBomNo = row.bom_no  // 保存当前操作的 BOM 编号
+  // 保存原始子件数据用于本地查重
+  originalChildren = JSON.parse(JSON.stringify(form.children))
   // 默认选中次版本升级
   form.versionUpgradeType = 'minor'
   form.version = versionOptions.value.minor
@@ -524,6 +527,21 @@ const submitForm = async () => {
       return ElMessage.warning('子件列表中存在重复物料，请合并用量或删除重复项')
     }
 
+    // ===== 另存为本地查重：检查是否修改过 =====
+    if (isSaveAsMode.value && originalChildren.length > 0) {
+      // 将当前 children 和原始 children 转换为 set 进行比较
+      const currentSet = new Set(form.children.map(c => `${c.child_id}-${c.dosage}`))
+      const originalSet = new Set(originalChildren.map(c => `${c.child_id}-${c.dosage}`))
+      
+      // 比较两个集合是否完全相同
+      const isIdentical = currentSet.size === originalSet.size && 
+        [...currentSet].every(item => originalSet.has(item))
+      
+      if (isIdentical) {
+        return ElMessage.warning('您未修改任何子件，与原版本内容一致，请修改后再保存')
+      }
+    }
+
     const payload = {
       bom_no: fullBomNo.value,
       version: form.version,
@@ -540,8 +558,11 @@ const submitForm = async () => {
         dialogVisible.value = false
         fetchBomList()
       } else { ElMessage.error(res.msg || '保存失败') }
-    } catch (e) {
-      // 错误已由全局拦截器统一处理
+    } catch (e: any) {
+      // 确保后端返回的错误信息能正确展示
+      if (e.response?.data?.msg) {
+        ElMessage.error(e.response.data.msg)
+      }
     }
     finally { saving.value = false }
   })