diff --git a/src/components/SimpleProcessDesignerV2/src/SimpleProcessModel.vue b/src/components/SimpleProcessDesignerV2/src/SimpleProcessModel.vue
index 8e2c5e39b..f1585aa06 100644
--- a/src/components/SimpleProcessDesignerV2/src/SimpleProcessModel.vue
+++ b/src/components/SimpleProcessDesignerV2/src/SimpleProcessModel.vue
@@ -36,7 +36,11 @@
       @mouseleave="stopDrag"
       @mouseenter="setGrabCursor"
     >
-      <ProcessNodeTree v-if="processNodeTree" v-model:flow-node="processNodeTree" />
+      <ProcessNodeTree
+        v-if="processNodeTree"
+        :key="importKey"
+        v-model:flow-node="processNodeTree"
+      />
     </div>
   </div>
   <Dialog v-model="errorDialogVisible" title="保存失败" width="400" :fullscreen="false">
@@ -222,16 +226,26 @@ const exportJson = () => {
 
 /** 导入 JSON */
 const refFile = ref()
+/** 导入后自增，作为 ProcessNodeTree 的 key，强制重新挂载以保证画布刷新 */
+const importKey = ref(0)
 const importJson = () => {
   refFile.value.click()
 }
 const importLocalFile = () => {
   const file = refFile.value.files[0]
+  // 清空 input 的 value，否则再次选择同一个文件时 change 事件不会触发
+  refFile.value.value = ''
+  if (!file) {
+    return
+  }
   const reader = new FileReader()
   reader.readAsText(file)
   reader.onload = function () {
     if (isString(this.result)) {
       processNodeTree.value = JSON.parse(this.result)
+      // 改变 key，强制 ProcessNodeTree 重新挂载，
+      // 规避 watch(() => props.flowNode) 在组件复用场景下同步失效导致画布不刷新的问题
+      importKey.value++
       emits('save', processNodeTree.value)
     }
   }
diff --git a/src/components/SimpleProcessDesignerV2/src/nodes-config/ChildProcessNodeConfig.vue b/src/components/SimpleProcessDesignerV2/src/nodes-config/ChildProcessNodeConfig.vue
index e0542dec8..0b2903ee0 100644
--- a/src/components/SimpleProcessDesignerV2/src/nodes-config/ChildProcessNodeConfig.vue
+++ b/src/components/SimpleProcessDesignerV2/src/nodes-config/ChildProcessNodeConfig.vue
@@ -546,7 +546,7 @@ const showChildProcessNodeConfig = (node: SimpleFlowNode) => {
       // 固定时长
       if (configForm.value.timeoutType === DelayTypeEnum.FIXED_TIME_DURATION) {
         const strTimeDuration = node.childProcessSetting.timeoutSetting.timeExpression ?? ''
-        let parseTime = strTimeDuration.slice(2, strTimeDuration.length - 1)
+        let parseTime = strTimeDuration.match(/\d+/)?.[0] ?? ''
         let parseTimeUnit = strTimeDuration.slice(strTimeDuration.length - 1)
         configForm.value.timeDuration = parseInt(parseTime)
         configForm.value.timeUnit = convertTimeUnit(parseTimeUnit)
@@ -603,12 +603,12 @@ const loadFormInfo = async () => {
   }
 }
 const getIsoTimeDuration = () => {
-  let strTimeDuration = 'PT'
+  let strTimeDuration = 'P'
   if (configForm.value.timeUnit === TimeUnitType.MINUTE) {
-    strTimeDuration += configForm.value.timeDuration + 'M'
+    strTimeDuration += 'T' + configForm.value.timeDuration + 'M'
   }
   if (configForm.value.timeUnit === TimeUnitType.HOUR) {
-    strTimeDuration += configForm.value.timeDuration + 'H'
+    strTimeDuration += 'T' + configForm.value.timeDuration + 'H'
   }
   if (configForm.value.timeUnit === TimeUnitType.DAY) {
     strTimeDuration += configForm.value.timeDuration + 'D'
diff --git a/src/components/SimpleProcessDesignerV2/src/nodes-config/DelayTimerNodeConfig.vue b/src/components/SimpleProcessDesignerV2/src/nodes-config/DelayTimerNodeConfig.vue
index 741796d3a..599c8d0c6 100644
--- a/src/components/SimpleProcessDesignerV2/src/nodes-config/DelayTimerNodeConfig.vue
+++ b/src/components/SimpleProcessDesignerV2/src/nodes-config/DelayTimerNodeConfig.vue
@@ -152,12 +152,12 @@ const getShowText = (): string => {
   return showText
 }
 const getIsoTimeDuration = () => {
-  let strTimeDuration = 'PT'
+  let strTimeDuration = 'P'
   if (configForm.value.timeUnit === TimeUnitType.MINUTE) {
-    strTimeDuration += configForm.value.timeDuration + 'M'
+    strTimeDuration += 'T' + configForm.value.timeDuration + 'M'
   }
   if (configForm.value.timeUnit === TimeUnitType.HOUR) {
-    strTimeDuration += configForm.value.timeDuration + 'H'
+    strTimeDuration += 'T' + configForm.value.timeDuration + 'H'
   }
   if (configForm.value.timeUnit === TimeUnitType.DAY) {
     strTimeDuration += configForm.value.timeDuration + 'D'
@@ -172,7 +172,7 @@ const showDelayTimerNodeConfig = (node: SimpleFlowNode) => {
     // 固定时长
     if (configForm.value.delayType === DelayTypeEnum.FIXED_TIME_DURATION) {
       const strTimeDuration = node.delaySetting.delayTime
-      let parseTime = strTimeDuration.slice(2, strTimeDuration.length - 1)
+      let parseTime = strTimeDuration.match(/\d+/)?.[0] ?? ''
       let parseTimeUnit = strTimeDuration.slice(strTimeDuration.length - 1)
       configForm.value.timeDuration = parseInt(parseTime)
       configForm.value.timeUnit = convertTimeUnit(parseTimeUnit)
diff --git a/src/components/SimpleProcessDesignerV2/src/nodes-config/UserTaskNodeConfig.vue b/src/components/SimpleProcessDesignerV2/src/nodes-config/UserTaskNodeConfig.vue
index f8ab8abf5..e1043408e 100644
--- a/src/components/SimpleProcessDesignerV2/src/nodes-config/UserTaskNodeConfig.vue
+++ b/src/components/SimpleProcessDesignerV2/src/nodes-config/UserTaskNodeConfig.vue
@@ -816,7 +816,7 @@ const showUserTaskNodeConfig = (node: SimpleFlowNode) => {
   configForm.value.timeoutHandlerEnable = node.timeoutHandler?.enable
   if (node.timeoutHandler?.enable && node.timeoutHandler?.timeDuration) {
     const strTimeDuration = node.timeoutHandler.timeDuration
-    let parseTime = strTimeDuration.slice(2, strTimeDuration.length - 1)
+    let parseTime = strTimeDuration.match(/\d+/)?.[0] ?? ''
     let parseTimeUnit = strTimeDuration.slice(strTimeDuration.length - 1)
     configForm.value.timeDuration = parseInt(parseTime)
     timeUnit.value = convertTimeUnit(parseTimeUnit)
@@ -938,12 +938,12 @@ function useTimeoutHandler() {
     if (!configForm.value.timeoutHandlerEnable) {
       return undefined
     }
-    let strTimeDuration = 'PT'
+    let strTimeDuration = 'P'
     if (timeUnit.value === TimeUnitType.MINUTE) {
-      strTimeDuration += configForm.value.timeDuration + 'M'
+      strTimeDuration += 'T' + configForm.value.timeDuration + 'M'
     }
     if (timeUnit.value === TimeUnitType.HOUR) {
-      strTimeDuration += configForm.value.timeDuration + 'H'
+      strTimeDuration += 'T' + configForm.value.timeDuration + 'H'
     }
     if (timeUnit.value === TimeUnitType.DAY) {
       strTimeDuration += configForm.value.timeDuration + 'D'
diff --git a/src/views/bpm/processInstance/detail/ProcessInstanceOperationButton.vue b/src/views/bpm/processInstance/detail/ProcessInstanceOperationButton.vue
index 7f6134c15..707e4cd90 100644
--- a/src/views/bpm/processInstance/detail/ProcessInstanceOperationButton.vue
+++ b/src/views/bpm/processInstance/detail/ProcessInstanceOperationButton.vue
@@ -816,7 +816,8 @@ const initNextAssigneesFormField = async () => {
           isEmpty(node.candidateUsers) &&
           CandidateStrategy.START_USER_SELECT === node.candidateStrategy) ||
         // 情况二：当前节点是审批人自选
-        CandidateStrategy.APPROVE_USER_SELECT === node.candidateStrategy
+        (isEmpty(node.candidateUsers) &&
+          CandidateStrategy.APPROVE_USER_SELECT === node.candidateStrategy)
       ) {
         nextAssigneesActivityNode.value.push(node)
       }
@@ -849,7 +850,7 @@ const validateNextAssignees = () => {
   }
   // 如果需要自选审批人，则校验每个节点是否都已配置审批人
   for (const item of nextAssigneesActivityNode.value) {
-    if (isEmpty(approveReasonForm.nextAssignees[item.id])) {
+    if (isEmpty(item.candidateUsers) && isEmpty(approveReasonForm.nextAssignees[item.id])) {
       message.warning('下一个节点的审批人不能为空!')
       return false
     }