diff --git a/src/locales/en.json b/src/locales/en.json
index 2b41b0bd..4b85e3b9 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -1096,7 +1096,10 @@
 					"disabled": "Disabled",
 					"please_select_status": "Please select status",
 					"import_file": "Import File",
-					"duplicate_import_name": "Inspection item name {name} is duplicated. Remove duplicates and upload again."
+					"duplicate_import_name": "Inspection item name {name} is duplicated. Remove duplicates and upload again.",
+					"enter_device_category_name": "Enter device category name",
+					"current_device_category": "Current Device Category",
+					"no_data": "No Data"
 				},
 				"inspection_records": {
 					"search": "Search",
diff --git a/src/locales/zh-chs.json b/src/locales/zh-chs.json
index a2955079..d2147a84 100644
--- a/src/locales/zh-chs.json
+++ b/src/locales/zh-chs.json
@@ -1096,7 +1096,10 @@
 					"disabled": "禁用",
 					"please_select_status": "请选择状态",
 					"import_file": "数据导入表格",
-					"duplicate_import_name": "【{name}】项目名称存在重复值，请去掉重复值并重新上传"
+					"duplicate_import_name": "【{name}】项目名称存在重复值，请去掉重复值并重新上传",
+					"enter_device_category_name": "请输入设备类别名称",
+					"current_device_category": "当前设备类别",
+					"no_data": "无数据"
 				},
 				"inspection_records": {
 					"search": "查询",
diff --git a/src/views/equipment-management/inspection-management/inspection-items/index.vue b/src/views/equipment-management/inspection-management/inspection-items/index.vue
index 191c38d9..14896f98 100644
--- a/src/views/equipment-management/inspection-management/inspection-items/index.vue
+++ b/src/views/equipment-management/inspection-management/inspection-items/index.vue
@@ -1,54 +1,88 @@
 <template>
   <d2-container>
-    <template #header>
-      <div class="search-bar">
-        <el-form :inline="true" :model="search" size="mini">
-          <el-form-item :label="$t(key('device_category'))">
-            <el-select v-model="search.device_category_id" :placeholder="$t(key('please_select_device_category'))" clearable filterable style="width:200px">
-              <el-option v-for="item in deviceCategoryOptions" :key="item.value" :label="item.label" :value="item.value" />
-            </el-select>
-          </el-form-item>
-          <el-form-item :label="$t(key('inspection_item_name'))">
-            <el-input v-model.trim="search.name" :placeholder="$t(key('enter_inspection_item_name'))" clearable style="width:200px" @keyup.enter.native="onSearch" />
-          </el-form-item>
-          <el-form-item :label="$t(key('check_method'))">
-            <el-input v-model.trim="search.check_method" :placeholder="$t(key('enter_check_method'))" clearable style="width:190px" @keyup.enter.native="onSearch" />
-          </el-form-item>
-          <el-form-item :label="$t(key('standard'))">
-            <el-input v-model.trim="search.standard" :placeholder="$t(key('enter_standard'))" clearable style="width:190px" @keyup.enter.native="onSearch" />
-          </el-form-item>
-          <el-form-item :label="$t(key('unit'))">
-            <el-input v-model.trim="search.unit" :placeholder="$t(key('enter_unit'))" clearable style="width:160px" @keyup.enter.native="onSearch" />
-          </el-form-item>
-          <el-form-item :label="$t(key('create_time'))">
-            <el-date-picker v-model="search.create_time" type="datetimerange" value-format="yyyy-MM-dd HH:mm:ss" :start-placeholder="$t(key('start_time'))" :end-placeholder="$t(key('end_time'))" style="width:330px" />
-          </el-form-item>
-          <el-form-item>
-            <el-button type="primary" icon="el-icon-search" @click="onSearch">{{ $t(key('search')) }}</el-button>
-            <el-button icon="el-icon-refresh" @click="onReset">{{ $t(key('reset')) }}</el-button>
-          </el-form-item>
-        </el-form>
-      </div>
-    </template>
+    <div class="inspection-items-page">
+      <aside class="category-panel" v-loading="treeLoading">
+        <el-input
+          v-model.trim="categoryFilter"
+          size="mini"
+          :placeholder="$t(key('enter_device_category_name'))"
+          clearable
+          class="category-filter"
+        />
+        <el-tree
+          v-if="deviceCategoryTree.length"
+          ref="categoryTree"
+          :data="deviceCategoryTree"
+          show-checkbox
+          highlight-current
+          default-expand-all
+          node-key="id"
+          :expand-on-click-node="false"
+          :default-checked-keys="currentCategoryId ? [currentCategoryId] : []"
+          :current-node-key="currentCategoryId"
+          :filter-node-method="filterCategoryNode"
+          @node-click="handleCategoryClick"
+          @check-change="handleCategoryCheckChange"
+        >
+          <template #default="{ node, data }">
+            <span class="category-node">
+              <span>{{ node.label }}</span>
+              <span class="category-code">({{ data.code || '-' }})</span>
+            </span>
+          </template>
+        </el-tree>
+        <el-result v-else icon="info" :title="$t(key('no_data'))" sub-title="" />
+      </aside>
 
-    <page-table
-      ref="pageTable"
-      :columns="columns"
-      :data="tableData"
-      :loading="loading"
-      :toolbar-buttons="toolbarButtons"
-      :row-buttons="rowButtons"
-      :pagination="pagination"
-      auto-height
-      @page-change="onPageChange"
-      @selection-change="selectedRows = $event"
-    >
-      <template #col-status="{ row }">
-        <el-tag :type="Number(row.status) === 1 ? 'success' : 'info'" size="mini">
-          {{ Number(row.status) === 1 ? $t(key('enabled')) : $t(key('disabled')) }}
-        </el-tag>
-      </template>
-    </page-table>
+      <section class="items-panel">
+        <div class="items-context">
+          <span class="context-label">{{ $t(key('current_device_category')) }}</span>
+          <strong>{{ currentCategoryLabel || '-' }}</strong>
+        </div>
+        <div class="search-bar">
+          <el-form :inline="true" :model="search" size="mini">
+            <el-form-item :label="$t(key('inspection_item_name'))">
+              <el-input v-model.trim="search.name" :placeholder="$t(key('enter_inspection_item_name'))" clearable style="width:200px" @keyup.enter.native="onSearch" />
+            </el-form-item>
+            <el-form-item :label="$t(key('check_method'))">
+              <el-input v-model.trim="search.check_method" :placeholder="$t(key('enter_check_method'))" clearable style="width:190px" @keyup.enter.native="onSearch" />
+            </el-form-item>
+            <el-form-item :label="$t(key('standard'))">
+              <el-input v-model.trim="search.standard" :placeholder="$t(key('enter_standard'))" clearable style="width:190px" @keyup.enter.native="onSearch" />
+            </el-form-item>
+            <el-form-item :label="$t(key('unit'))">
+              <el-input v-model.trim="search.unit" :placeholder="$t(key('enter_unit'))" clearable style="width:160px" @keyup.enter.native="onSearch" />
+            </el-form-item>
+            <el-form-item :label="$t(key('create_time'))">
+              <el-date-picker v-model="search.create_time" type="datetimerange" value-format="yyyy-MM-dd HH:mm:ss" :start-placeholder="$t(key('start_time'))" :end-placeholder="$t(key('end_time'))" style="width:330px" />
+            </el-form-item>
+            <el-form-item>
+              <el-button type="primary" icon="el-icon-search" @click="onSearch">{{ $t(key('search')) }}</el-button>
+              <el-button icon="el-icon-refresh" @click="onReset">{{ $t(key('reset')) }}</el-button>
+            </el-form-item>
+          </el-form>
+        </div>
+
+        <page-table
+          ref="pageTable"
+          :columns="columns"
+          :data="tableData"
+          :loading="loading"
+          :toolbar-buttons="toolbarButtons"
+          :row-buttons="rowButtons"
+          :pagination="pagination"
+          auto-height
+          @page-change="onPageChange"
+          @selection-change="selectedRows = $event"
+        >
+          <template #col-status="{ row }">
+            <el-tag :type="Number(row.status) === 1 ? 'success' : 'info'" size="mini">
+              {{ Number(row.status) === 1 ? $t(key('enabled')) : $t(key('disabled')) }}
+            </el-tag>
+          </template>
+        </page-table>
+      </section>
+    </div>
 
     <page-dialog-form
       ref="dialogForm"
@@ -70,7 +104,7 @@
       <el-alert :title="$t(key('import_tip'))" type="warning" :closable="false" />
       <el-form size="mini" label-width="130px" class="import-form">
         <el-form-item :label="$t(key('device_category'))" required>
-          <el-select v-model="importDeviceCategoryId" :placeholder="$t(key('please_select_device_category'))" clearable filterable style="width:260px">
+          <el-select v-model="importDeviceCategoryId" :placeholder="$t(key('please_select_device_category'))" disabled style="width:260px">
             <el-option v-for="item in deviceCategoryOptions" :key="item.value" :label="item.label" :value="item.value" />
           </el-select>
         </el-form-item>
@@ -118,8 +152,16 @@ function readPageData (res) {
   return { list: [], total: 0 }
 }
 
-function toOptions (list) {
-  return (Array.isArray(list) ? list : []).map(item => ({ label: item.name || item.label, value: item.id || item.value, raw: item }))
+function normalizeCategories (list) {
+  return (Array.isArray(list) ? list : []).map((item, index) => ({
+    id: item.id || item.value,
+    value: item.id || item.value,
+    label: item.name || item.label,
+    name: item.name || item.label,
+    code: item.code || '',
+    index,
+    children: []
+  }))
 }
 
 export default {
@@ -129,11 +171,16 @@ export default {
   data () {
     return {
       loading: false,
+      treeLoading: false,
       submitting: false,
       tableData: [],
       selectedRows: [],
+      categoryFilter: '',
+      deviceCategoryTree: [],
       deviceCategoryOptions: [],
-      search: { device_category_id: '', name: '', check_method: '', standard: '', unit: '', create_time: [] },
+      currentCategoryId: '',
+      currentCategory: null,
+      search: { name: '', check_method: '', standard: '', unit: '', create_time: [] },
       pagination: { current: 1, size: 10, total: 0 },
       dialogVisible: false,
       dialogTitle: '',
@@ -160,11 +207,15 @@ export default {
     }
   },
   computed: {
+    currentCategoryLabel () {
+      if (!this.currentCategory) return ''
+      return `${this.currentCategory.label}${this.currentCategory.code ? ` (${this.currentCategory.code})` : ''}`
+    },
     formCols () {
       return [
         [
           { type: 'input', prop: 'name', label: this.key('inspection_item_name'), placeholder: this.key('enter_inspection_item_name'), style: { width: '100%' } },
-          { type: 'select', prop: 'device_category_id', label: this.key('device_category'), placeholder: this.key('please_select_device_category'), options: this.deviceCategoryOptions, style: { width: '100%' } }
+          { type: 'select', prop: 'device_category_id', label: this.key('device_category'), placeholder: this.key('please_select_device_category'), options: this.deviceCategoryOptions, disabled: true, style: { width: '100%' } }
         ],
         [
           { type: 'select', prop: 'status', label: this.key('status'), placeholder: this.key('please_select_status'), options: [{ label: this.$t(this.key('enabled')), value: 1 }, { label: this.$t(this.key('disabled')), value: 0 }], style: { width: '100%' } },
@@ -182,11 +233,15 @@ export default {
       ]
     }
   },
+  watch: {
+    categoryFilter (val) {
+      if (this.$refs.categoryTree) this.$refs.categoryTree.filter(val)
+    }
+  },
   created () {
     this.columns = useTableColumns([
       { prop: 'sort', label: this.key('sort'), width: 80 },
       { prop: 'name', label: this.key('inspection_item_name'), minWidth: 150 },
-      { prop: 'device_category_name', label: this.key('device_category'), minWidth: 140 },
       { prop: 'status', label: this.key('status'), slot: 'status', width: 100 },
       { prop: 'standard', label: this.key('standard'), minWidth: 140, showOverflowTooltip: true },
       { prop: 'check_method', label: this.key('check_method'), minWidth: 140, showOverflowTooltip: true },
@@ -212,22 +267,66 @@ export default {
     this.toolbarButtons = btns.toolbarButtons
     this.rowButtons = btns.rowButtons
     this.loadDeviceCategories()
-    this.fetchData()
   },
   methods: {
     emptyForm () {
       return { name: '', device_category_id: '', status: 1, standard: '', check_method: '', unit: '', frequentness: '', example: '', remark: '' }
     },
     async loadDeviceCategories () {
-      const res = await getEquipmentCategoryALL({})
-      this.deviceCategoryOptions = toOptions((res && res.data) || res)
+      this.treeLoading = true
+      try {
+        const res = await getEquipmentCategoryALL({ no_denglu_sign: 'no' })
+        const list = normalizeCategories((res && res.data) || res)
+        this.deviceCategoryTree = list
+        this.deviceCategoryOptions = list.map(item => ({ label: item.label, value: item.id, raw: item }))
+        if (list.length) {
+          this.setCurrentCategory(list[0], false)
+          this.$nextTick(() => {
+            if (this.$refs.categoryTree) {
+              this.$refs.categoryTree.setCheckedKeys([this.currentCategoryId])
+              this.$refs.categoryTree.setCurrentKey(this.currentCategoryId)
+            }
+          })
+          this.fetchData()
+        }
+      } finally {
+        this.treeLoading = false
+      }
+    },
+    setCurrentCategory (category, shouldFetch = true) {
+      this.currentCategory = category
+      this.currentCategoryId = category ? category.id : ''
+      this.selectedRows = []
+      this.pagination.current = 1
+      if (shouldFetch) this.fetchData()
+    },
+    filterCategoryNode (value, data) {
+      if (!value) return true
+      const text = String(value).toLowerCase()
+      return String(data.label || '').toLowerCase().includes(text) || String(data.code || '').toLowerCase().includes(text)
+    },
+    handleCategoryClick (data) {
+      this.setCurrentCategory(data)
+      this.$nextTick(() => {
+        if (this.$refs.categoryTree) this.$refs.categoryTree.setCheckedKeys([data.id])
+      })
+    },
+    handleCategoryCheckChange (data, checked) {
+      if (!checked) return
+      if (this.$refs.categoryTree) this.$refs.categoryTree.setCheckedKeys([data.id])
+      if (String(data.id) !== String(this.currentCategoryId)) this.setCurrentCategory(data)
     },
     buildSearchParams () {
-      const params = { ...this.search }
+      const params = { ...this.search, device_category_id: this.currentCategoryId }
       if (!Array.isArray(params.create_time) || !params.create_time.length) delete params.create_time
       return params
     },
     async fetchData () {
+      if (!this.currentCategoryId) {
+        this.tableData = []
+        this.pagination.total = 0
+        return
+      }
       this.loading = true
       try {
         const res = await getList({ ...this.buildSearchParams(), page_no: this.pagination.current, page_size: this.pagination.size })
@@ -243,7 +342,7 @@ export default {
       this.fetchData()
     },
     onReset () {
-      this.search = { device_category_id: '', name: '', check_method: '', standard: '', unit: '', create_time: [] }
+      this.search = { name: '', check_method: '', standard: '', unit: '', create_time: [] }
       this.pagination.current = 1
       this.fetchData()
     },
@@ -256,10 +355,17 @@ export default {
       this.formData = this.emptyForm()
       this.editId = ''
     },
+    ensureCategorySelected () {
+      if (this.currentCategoryId) return true
+      this.$message.warning(this.$t(this.key('please_select_device_category')))
+      return false
+    },
     openAdd () {
+      if (!this.ensureCategorySelected()) return
       this.handleType = 'create'
       this.dialogTitle = this.key('add_title')
       this.resetForm()
+      this.formData.device_category_id = this.currentCategoryId
       this.dialogVisible = true
     },
     openEdit (row) {
@@ -268,7 +374,7 @@ export default {
       this.editId = row.id
       this.formData = {
         name: row.name || '',
-        device_category_id: row.device_category_id || '',
+        device_category_id: row.device_category_id || this.currentCategoryId,
         status: Number(row.status),
         standard: row.standard || '',
         check_method: row.check_method || '',
@@ -282,8 +388,9 @@ export default {
     async onDialogSubmit () {
       this.submitting = true
       try {
-        if (this.handleType === 'create') await createItem(this.formData)
-        else await editItem({ ...this.formData, id: this.editId })
+        const payload = { ...this.formData, device_category_id: this.currentCategoryId }
+        if (this.handleType === 'create') await createItem(payload)
+        else await editItem({ ...payload, id: this.editId })
         this.$message.success(this.$t(this.key('operation_success')))
         this.dialogVisible = false
         this.fetchData()
@@ -317,7 +424,8 @@ export default {
       }
     },
     openImport () {
-      this.importDeviceCategoryId = ''
+      if (!this.ensureCategorySelected()) return
+      this.importDeviceCategoryId = this.currentCategoryId
       this.importFileList = []
       this.importRows = []
       this.importVisible = true
@@ -394,7 +502,64 @@ export default {
 </script>
 
 <style scoped>
-.search-bar { padding: 10px 0; }
-.import-form { margin-top: 14px; }
-/deep/ .el-form-item--mini.el-form-item { margin-bottom: 4px; }
+.inspection-items-page {
+  display: flex;
+  gap: 16px;
+  height: 100%;
+  min-height: 560px;
+}
+.category-panel {
+  flex: 0 0 260px;
+  min-width: 220px;
+  border-right: 1px solid #ebeef5;
+  padding: 10px 14px 10px 0;
+  overflow: auto;
+}
+.category-filter {
+  margin-bottom: 12px;
+}
+.category-node {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  max-width: 190px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.category-code {
+  color: #909399;
+  font-size: 12px;
+}
+.items-panel {
+  flex: 1;
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+}
+.items-context {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-height: 30px;
+  margin-bottom: 8px;
+  color: #303133;
+}
+.context-label {
+  color: #909399;
+}
+.search-bar {
+  padding-bottom: 8px;
+  border-bottom: 1px solid #ebeef5;
+  margin-bottom: 10px;
+}
+.import-form {
+  margin-top: 14px;
+}
+/deep/ .el-form-item--mini.el-form-item {
+  margin-bottom: 4px;
+}
+/deep/ .d2-container-full__body {
+  overflow: hidden;
+}
 </style>