diff --git a/frontend/src/views/BudgetManagement.vue b/frontend/src/views/BudgetManagement.vue
index a7a1e91c..1758ebda 100644
--- a/frontend/src/views/BudgetManagement.vue
+++ b/frontend/src/views/BudgetManagement.vue
@@ -668,8 +668,8 @@
             <template #footer><el-button @click="showAttributionDialog = false">关闭</el-button></template>
           </el-dialog>
 
-          <!-- 年度预算分解弹窗 (P1-① 年度分解按钮修复) -->
-          <el-dialog v-model="showDecompose" title="年度预算分解" width="640" append-to-body>
+          <!-- 年度预算分解弹窗 (P1-① 年度分解按钮修复; MyDialog 铁律) -->
+          <MyDialog v-model="showDecompose" title="年度预算分解" :width="640">
             <el-form :model="decomposeForm" label-width="100px" style="max-width:480px;">
               <el-form-item label="年份">
                 <el-select v-model="decomposeForm.year" style="width:150px;">
@@ -695,7 +695,7 @@
               <el-button @click="showDecompose = false">取消</el-button>
               <el-button type="primary" @click="doDecompose" :loading="decomposing">执行分解</el-button>
             </template>
-          </el-dialog>
+          </MyDialog>
         </el-tabs>
       </el-tab-pane>
     </el-tabs>