diff --git a/src/api/bpm/task/index.ts b/src/api/bpm/task/index.ts
index ccd5c4ee..a18ba998 100644
--- a/src/api/bpm/task/index.ts
+++ b/src/api/bpm/task/index.ts
@@ -58,3 +58,24 @@ export const returnTask = async (data) => {
 export const delegateTask = async (data) => {
   return await request.put({ url: '/bpm/task/delegate', data })
 }
+
+/**
+ * 加签
+ */
+export const taskAddSign = async (data) => {
+  return await request.put({ url: '/bpm/task/add-sign', data })
+}
+
+/**
+ * 获取减签任务列表
+ */
+export const getSubSignTaskList = async (id: string) => {
+  return await request.get({ url: '/bpm/task/get-sub-sign?taskId=' + id })
+}
+
+/**
+ * 减签
+ */
+export const taskSubSign = async (data) => {
+  return await request.put({ url: '/bpm/task/sub-sign', data })
+}
diff --git a/src/components/bpmnProcessDesigner/package/designer/ProcessViewer.vue b/src/components/bpmnProcessDesigner/package/designer/ProcessViewer.vue
index e2cd4679..ed4fde9d 100644
--- a/src/components/bpmnProcessDesigner/package/designer/ProcessViewer.vue
+++ b/src/components/bpmnProcessDesigner/package/designer/ProcessViewer.vue
@@ -250,6 +250,12 @@ const getResultCss = (result) => {
   } else if (result === 5) {
     // 退回
     return 'highlight-return'
+  } else if (result === 6) {
+    // 委派
+    return 'highlight-return'
+  } else if (result === 7 || result === 8 || result === 9) {
+    // 待后加签任务完成/待前加签任务完成/待前置任务完成
+    return 'highlight-return'
   }
   return ''
 }
@@ -362,7 +368,7 @@ const elementHover = (element) => {
       }
     }
     console.log(html, 'html111111111111111')
-    elementOverlayIds.value[element.value.id] = toRaw(overlays.value).add(element.value, {
+    elementOverlayIds.value[element.value.id] = toRaw(overlays.value)?.add(element.value, {
       position: { left: 0, bottom: 0 },
       html: `<div class="element-overlays">${html}</div>`
     })
diff --git a/src/utils/is.ts b/src/utils/is.ts
index 37529859..cb8f1a0e 100644
--- a/src/utils/is.ts
+++ b/src/utils/is.ts
@@ -19,6 +19,9 @@ export const isObject = (val: any): val is Record<any, any> => {
 }
 
 export const isEmpty = <T = unknown>(val: T): val is T => {
+  if (val === null) {
+    return true
+  }
   if (isArray(val) || isString(val)) {
     return val.length === 0
   }
diff --git a/src/views/bpm/processInstance/detail/ProcessInstanceChildrenTaskList.vue b/src/views/bpm/processInstance/detail/ProcessInstanceChildrenTaskList.vue
new file mode 100644
index 00000000..962d0a00
--- /dev/null
+++ b/src/views/bpm/processInstance/detail/ProcessInstanceChildrenTaskList.vue
@@ -0,0 +1,86 @@
+<template>
+  <el-drawer v-model="drawerVisible" title="子任务" size="70%">
+    <template #header>
+      <h4>【{{ baseTask.name }} 】审批人：{{ baseTask.assigneeUser?.nickname }}</h4>
+      <el-button style="margin-left: 5px" type="danger" plain @click="handleSubSign(baseTask)">
+        <Icon icon="ep:remove" />
+        减签
+      </el-button>
+    </template>
+    <el-table :data="tableData" style="width: 100%" row-key="id" border>
+      <el-table-column prop="assigneeUser.nickname" label="审批人" />
+      <el-table-column prop="assigneeUser.deptName" label="所在部门" />
+      <el-table-column label="审批状态" prop="result">
+        <template #default="scope">
+          <dict-tag :type="DICT_TYPE.BPM_PROCESS_INSTANCE_RESULT" :value="scope.row.result" />
+        </template>
+      </el-table-column>
+      <el-table-column
+        label="提交时间"
+        align="center"
+        prop="createTime"
+        width="180"
+        :formatter="dateFormatter"
+      />
+      <el-table-column
+        label="结束时间"
+        align="center"
+        prop="endTime"
+        width="180"
+        :formatter="dateFormatter"
+      />
+      <el-table-column label="操作" prop="operation">
+        <template #default="scope">
+          <el-button
+            v-if="!isEmpty(scope.row.children)"
+            type="danger"
+            plain
+            @click="handleSubSign(scope.row)"
+          >
+            <Icon icon="ep:remove" />
+            减签
+          </el-button>
+        </template>
+      </el-table-column>
+    </el-table>
+    <!--  减签   -->
+    <TaskSubSignDialogForm ref="taskSubSignDialogForm" />
+  </el-drawer>
+</template>
+<script lang="ts" setup>
+import { isEmpty } from '@/utils/is'
+import { DICT_TYPE } from '@/utils/dict'
+import { dateFormatter } from '@/utils/formatTime'
+import TaskSubSignDialogForm from './TaskSubSignDialogForm.vue'
+
+const message = useMessage() // 消息弹窗
+defineOptions({ name: 'ProcessInstancechildrenList' })
+
+const drawerVisible = ref(false) // 抽屉的是否展示
+
+const tableData = ref<any[]>([]) //表格数据
+const baseTask = ref<object>({})
+/** 打开弹窗 */
+const open = async (task: any) => {
+  if (isEmpty(task.children)) {
+    message.warning('该任务没有子任务')
+    return
+  }
+  baseTask.value = task
+  //设置表格数据
+  tableData.value = task.children
+  //展开抽屉
+  drawerVisible.value = true
+}
+defineExpose({ open }) // 提供 openModal 方法，用于打开弹窗
+
+const emit = defineEmits(['success']) // 定义 success 事件，用于操作成功后的回调
+
+/**
+ * 减签
+ */
+const taskSubSignDialogForm = ref()
+const handleSubSign = (item) => {
+  taskSubSignDialogForm.value.open(item.id)
+}
+</script>
diff --git a/src/views/bpm/processInstance/detail/ProcessInstanceTaskList.vue b/src/views/bpm/processInstance/detail/ProcessInstanceTaskList.vue
index 6f4557ae..97287e99 100644
--- a/src/views/bpm/processInstance/detail/ProcessInstanceTaskList.vue
+++ b/src/views/bpm/processInstance/detail/ProcessInstanceTaskList.vue
@@ -12,7 +12,18 @@
             :icon="getTimelineItemIcon(item)"
             :type="getTimelineItemType(item)"
           >
-            <p style="font-weight: 700">任务：{{ item.name }}</p>
+            <p style="font-weight: 700">
+              任务：{{ item.name }}
+              <dict-tag :type="DICT_TYPE.BPM_PROCESS_INSTANCE_RESULT" :value="item.result" />
+              <el-button
+                style="margin-left: 5px"
+                v-if="!isEmpty(item.children)"
+                @click="openChildrenTask(item)"
+              >
+                <Icon icon="ep:memo" />
+                子任务
+              </el-button>
+            </p>
             <el-card :body-style="{ padding: '10px' }">
               <label v-if="item.assigneeUser" style="margin-right: 30px; font-weight: normal">
                 审批人：{{ item.assigneeUser.nickname }}
@@ -42,11 +53,16 @@
         </el-timeline>
       </div>
     </el-col>
+    <!-- 子任务  -->
+    <ProcessInstanceChildrenTaskList ref="processInstanceChildrenTaskList" />
   </el-card>
 </template>
 <script lang="ts" setup>
 import { formatDate, formatPast2 } from '@/utils/formatTime'
 import { propTypes } from '@/utils/propTypes'
+import { DICT_TYPE } from '@/utils/dict'
+import { isEmpty } from '@/utils/is'
+import ProcessInstanceChildrenTaskList from './ProcessInstanceChildrenTaskList.vue'
 
 defineOptions({ name: 'BpmProcessInstanceTaskList' })
 
@@ -95,6 +111,18 @@ const getTimelineItemType = (item) => {
   if (item.result === 6) {
     return 'default'
   }
+  if (item.result === 7 || item.result === 8) {
+    return 'warning'
+  }
   return ''
 }
+
+/**
+ * 子任务
+ */
+const processInstanceChildrenTaskList = ref()
+
+const openChildrenTask = (item) => {
+  processInstanceChildrenTaskList.value.open(item)
+}
 </script>
diff --git a/src/views/bpm/processInstance/detail/TaskAddSignDialogForm.vue b/src/views/bpm/processInstance/detail/TaskAddSignDialogForm.vue
new file mode 100644
index 00000000..4b91c9b9
--- /dev/null
+++ b/src/views/bpm/processInstance/detail/TaskAddSignDialogForm.vue
@@ -0,0 +1,97 @@
+<template>
+  <Dialog v-model="dialogVisible" title="加签" width="500">
+    <el-form
+      ref="formRef"
+      v-loading="formLoading"
+      :model="formData"
+      :rules="formRules"
+      label-width="110px"
+    >
+      <el-form-item label="加签处理人" prop="userIdList">
+        <el-select v-model="formData.userIdList" multiple clearable style="width: 100%">
+          <el-option
+            v-for="item in userList"
+            :key="item.id"
+            :label="item.nickname"
+            :value="item.id"
+          />
+        </el-select>
+      </el-form-item>
+      <el-form-item label="加签理由" prop="reason">
+        <el-input v-model="formData.reason" clearable placeholder="请输入加签理由" />
+      </el-form-item>
+    </el-form>
+    <template #footer>
+      <el-button :disabled="formLoading" type="primary" @click="submitForm('before')"
+        >向前加签</el-button
+      >
+      <el-button :disabled="formLoading" type="primary" @click="submitForm('after')"
+        >向后加签</el-button
+      >
+      <el-button @click="dialogVisible = false">取 消</el-button>
+    </template>
+  </Dialog>
+</template>
+<script lang="ts" setup>
+import * as TaskApi from '@/api/bpm/task'
+import * as UserApi from '@/api/system/user'
+
+const message = useMessage() // 消息弹窗
+defineOptions({ name: 'BpmTaskUpdateAssigneeForm' })
+
+const dialogVisible = ref(false) // 弹窗的是否展示
+const formLoading = ref(false) // 表单的加载中
+const formData = ref({
+  id: '',
+  userIdList: [],
+  type: ''
+})
+const formRules = ref({
+  userIdList: [{ required: true, message: '加签处理人不能为空', trigger: 'change' }],
+  reason: [{ required: true, message: '加签理由不能为空', trigger: 'change' }]
+})
+
+const formRef = ref() // 表单 Ref
+const userList = ref<any[]>([]) // 用户列表
+
+/** 打开弹窗 */
+const open = async (id: string) => {
+  dialogVisible.value = true
+  resetForm()
+  formData.value.id = id
+  // 获得用户列表
+  userList.value = await UserApi.getSimpleUserList()
+}
+defineExpose({ open }) // 提供 openModal 方法，用于打开弹窗
+
+/** 提交表单 */
+const emit = defineEmits(['success']) // 定义 success 事件，用于操作成功后的回调
+const submitForm = async (type: string) => {
+  // 校验表单
+  if (!formRef) return
+  const valid = await formRef.value.validate()
+  if (!valid) return
+  // 提交请求
+  formLoading.value = true
+  formData.value.type = type
+  try {
+    await TaskApi.taskAddSign(formData.value)
+    message.success('加签成功')
+    dialogVisible.value = false
+    // 发送操作成功的事件
+    emit('success')
+  } finally {
+    formLoading.value = false
+  }
+}
+
+/** 重置表单 */
+const resetForm = () => {
+  formData.value = {
+    id: '',
+    userIdList: [],
+    type: ''
+  }
+  formRef.value?.resetFields()
+}
+</script>
diff --git a/src/views/bpm/processInstance/detail/TaskSubSignDialogForm.vue b/src/views/bpm/processInstance/detail/TaskSubSignDialogForm.vue
new file mode 100644
index 00000000..f776ef86
--- /dev/null
+++ b/src/views/bpm/processInstance/detail/TaskSubSignDialogForm.vue
@@ -0,0 +1,85 @@
+<template>
+  <Dialog v-model="dialogVisible" title="减签" width="500">
+    <el-form
+      ref="formRef"
+      v-loading="formLoading"
+      :model="formData"
+      :rules="formRules"
+      label-width="110px"
+    >
+      <el-form-item label="减签任务" prop="id">
+        <el-radio-group v-model="formData.id">
+          <el-radio-button v-for="item in subTaskList" :key="item.id" :label="item.id">
+            {{ item.name }}({{ item.assigneeUser.deptName }}{{ item.assigneeUser.nickname }}--审批)
+          </el-radio-button>
+        </el-radio-group>
+      </el-form-item>
+      <el-form-item label="减签理由" prop="reason">
+        <el-input v-model="formData.reason" clearable placeholder="请输入减签理由" />
+      </el-form-item>
+    </el-form>
+    <template #footer>
+      <el-button :disabled="formLoading" type="primary" @click="submitForm">确 定</el-button>
+      <el-button @click="dialogVisible = false">取 消</el-button>
+    </template>
+  </Dialog>
+</template>
+<script lang="ts" name="TaskRollbackDialogForm" setup>
+import * as TaskApi from '@/api/bpm/task'
+import { isEmpty } from '@/utils/is'
+
+const message = useMessage() // 消息弹窗
+const dialogVisible = ref(false) // 弹窗的是否展示
+const formLoading = ref(false) // 表单的加载中
+const formData = ref({
+  id: '',
+  reason: ''
+})
+const formRules = ref({
+  id: [{ required: true, message: '必须选择减签任务', trigger: 'change' }],
+  reason: [{ required: true, message: '减签理由不能为空', trigger: 'blur' }]
+})
+
+const formRef = ref() // 表单 Ref
+const subTaskList = ref([])
+/** 打开弹窗 */
+const open = async (id: string) => {
+  subTaskList.value = await TaskApi.getSubSignTaskList(id)
+  if (isEmpty(subTaskList.value)) {
+    message.warning('当前没有可减签的任务')
+    return false
+  }
+  dialogVisible.value = true
+  resetForm()
+}
+defineExpose({ open }) // 提供 openModal 方法，用于打开弹窗
+
+/** 提交表单 */
+const emit = defineEmits(['success']) // 定义 success 事件，用于操作成功后的回调
+const submitForm = async () => {
+  // 校验表单
+  if (!formRef) return
+  const valid = await formRef.value.validate()
+  if (!valid) return
+  // 提交请求
+  formLoading.value = true
+  try {
+    await TaskApi.taskSubSign(formData.value)
+    message.success('减签成功')
+    dialogVisible.value = false
+    // 发送操作成功的事件
+    emit('success')
+  } finally {
+    formLoading.value = false
+  }
+}
+
+/** 重置表单 */
+const resetForm = () => {
+  formData.value = {
+    id: '',
+    reason: ''
+  }
+  formRef.value?.resetFields()
+}
+</script>
diff --git a/src/views/bpm/processInstance/detail/index.vue b/src/views/bpm/processInstance/detail/index.vue
index 585c60db..f9c5452b 100644
--- a/src/views/bpm/processInstance/detail/index.vue
+++ b/src/views/bpm/processInstance/detail/index.vue
@@ -49,6 +49,10 @@
             <Icon icon="ep:position" />
             委派
           </el-button>
+          <el-button type="primary" @click="handleSign(item)">
+            <Icon icon="ep:plus" />
+            加签
+          </el-button>
           <el-button type="warning" @click="handleBack(item)">
             <Icon icon="ep:back" />
             回退
@@ -95,6 +99,8 @@
     <TaskReturnDialog ref="taskReturnDialogRef" @success="getDetail" />
     <!-- 委派，将任务委派给别人处理，处理完成后，会重新回到原审批人手中-->
     <TaskDelegateForm ref="taskDelegateForm" @success="getDetail" />
+    <!-- 加签，当前任务审批人为A，向前加签选了一个C，则需要C先审批，然后再是A审批，向后加签B，A审批完，需要B再审批完，才算完成这个任务节点 -->
+    <TaskAddSignDialogForm ref="taskAddSignDialogForm" @success="getDetail" />
   </ContentWrap>
 </template>
 <script lang="ts" setup>
@@ -109,7 +115,9 @@ import ProcessInstanceBpmnViewer from './ProcessInstanceBpmnViewer.vue'
 import ProcessInstanceTaskList from './ProcessInstanceTaskList.vue'
 import TaskReturnDialog from './TaskReturnDialogForm.vue'
 import TaskDelegateForm from './taskDelegateForm.vue'
+import TaskAddSignDialogForm from './TaskAddSignDialogForm.vue'
 import { registerComponent } from '@/utils/routerHelper'
+import { isEmpty } from '@/utils/is'
 
 defineOptions({ name: 'BpmProcessInstanceDetail' })
 
@@ -185,6 +193,12 @@ const handleBack = async (task) => {
   taskReturnDialogRef.value.open(task.id)
 }
 
+const taskAddSignDialogForm = ref()
+/** 处理审批加签的操作 */
+const handleSign = async (task) => {
+  taskAddSignDialogForm.value.open(task.id)
+}
+
 /** 获得详情 */
 const getDetail = () => {
   // 1. 获得流程实例相关
@@ -261,26 +275,36 @@ const getTaskList = async () => {
     // 获得需要自己审批的任务
     runningTasks.value = []
     auditForms.value = []
-    tasks.value.forEach((task) => {
-      // 2.1 只有待处理才需要
-      if (task.result !== 1 && task.result !== 6) {
-        return
-      }
-      // 2.2 自己不是处理人
-      if (!task.assigneeUser || task.assigneeUser.id !== userId) {
-        return
-      }
-      // 2.3 添加到处理任务
-      runningTasks.value.push({ ...task })
-      auditForms.value.push({
-        reason: ''
-      })
-    })
+    loadRunningTask(tasks.value)
   } finally {
     tasksLoad.value = false
   }
 }
 
+/**
+ * 设置 runningTasks 中的任务
+ */
+const loadRunningTask = (tasks) => {
+  tasks.forEach((task) => {
+    if (!isEmpty(task.children)) {
+      loadRunningTask(task.children)
+    }
+    // 2.1 只有待处理才需要
+    if (task.result !== 1 && task.result !== 6) {
+      return
+    }
+    // 2.2 自己不是处理人
+    if (!task.assigneeUser || task.assigneeUser.id !== userId) {
+      return
+    }
+    // 2.3 添加到处理任务
+    runningTasks.value.push({ ...task })
+    auditForms.value.push({
+      reason: ''
+    })
+  })
+}
+
 /** 初始化 */
 onMounted(() => {
   getDetail()