diff --git a/src/views/super/bpm/process/personalOffice/myHandleTask/content/MyHandleContent.vue b/src/views/super/bpm/process/personalOffice/myHandleTask/content/MyHandleContent.vue
index 929184f..102dd8d 100644
--- a/src/views/super/bpm/process/personalOffice/myHandleTask/content/MyHandleContent.vue
+++ b/src/views/super/bpm/process/personalOffice/myHandleTask/content/MyHandleContent.vue
@@ -122,6 +122,13 @@
   import { useUserStore } from '/@/store/modules/user';
   import { isString } from '/@/utils/is';
 
+  const REJECT_DEFAULT_REASON = '不同意，请退回修改。';
+  const REJECT_PROCESS_MODEL = '3';
+
+  function isRejectProcessModel(value) {
+    return String(value) === REJECT_PROCESS_MODEL;
+  }
+
   export default {
     name: 'MyHandleContent',
     components: {
@@ -229,24 +236,42 @@
       watchEffect(() => {
         props.turnbackTaskId && (model.rejectModelNode = props.turnbackTaskId);
       });
+      function applyAutoReason(value, extraAutoReasons = []) {
+        const nextReason = value || '';
+        const autoReasons = [lastAutoReason.value, ...extraAutoReasons].filter(Boolean);
+        const canApplyReason = !model.reason || autoReasons.includes(model.reason);
+        if (nextReason && canApplyReason) {
+          model.reason = nextReason;
+          lastAutoReason.value = nextReason;
+          return true;
+        }
+        if (!nextReason && model.reason === lastAutoReason.value) {
+          model.reason = '';
+        }
+        lastAutoReason.value = nextReason;
+        return false;
+      }
+
       // 默认处理意见只在空值或仍为上一条自动意见时刷新，避免覆盖用户手动输入。
       watch(
         () => props.defaultReason,
         (value) => {
-          const nextReason = value || '';
-          const canApplyDefaultReason = !model.reason || model.reason === lastAutoReason.value;
-          if (nextReason && canApplyDefaultReason) {
-            model.reason = nextReason;
-            lastAutoReason.value = nextReason;
+          if (isRejectProcessModel(model.processModel)) {
             return;
           }
-          if (!nextReason && model.reason === lastAutoReason.value) {
-            model.reason = '';
-          }
-          lastAutoReason.value = nextReason;
+          applyAutoReason(value);
         },
         { immediate: true }
       );
+      watch(
+        () => model.processModel,
+        (value) => {
+          const isReject = isRejectProcessModel(value);
+          applyAutoReason(isReject ? REJECT_DEFAULT_REASON : props.defaultReason, [
+            isReject ? props.defaultReason : REJECT_DEFAULT_REASON,
+          ]);
+        }
+      );
       // 选择下一步操作人
       const checkedNext = ref(false);
       const nextPersonList = ref([]);