diff --git a/src/views/modules/sampleTracking/projectProofTracking.vue b/src/views/modules/sampleTracking/projectProofTracking.vue
index ccfc6f4..caac7cd 100644
--- a/src/views/modules/sampleTracking/projectProofTracking.vue
+++ b/src/views/modules/sampleTracking/projectProofTracking.vue
@@ -2,7 +2,7 @@
   <div class="mod-config">
     <el-form :inline="true" :model="searchData" label-position="top" class="search-form">
       <el-form-item label="BU">
-        <el-select v-model="searchData.buNo" clearable filterable placeholder="全部" style="width: 130px" @change="handleSearchBuChange">
+        <el-select v-model="searchData.buNo" filterable placeholder="请选择" style="width: 130px" @change="handleSearchBuChange">
           <el-option
             v-for="item in userBuList"
             :key="`searchBu_${item.buNo}`"
@@ -1449,10 +1449,12 @@ export default {
     }
   },
   activated () {
-    Promise.all([this.loadUserBuList(), this.queryProcessColumns(), this.loadTrackingColumns()]).then(() => {
+    this.loadUserBuList().then(() => {
+      return Promise.all([this.queryProcessColumns(), this.loadTrackingColumns()])
+    }).then(() => {
       this.queryBuProcessConfig()
+      this.getDataList()
     })
-    this.getDataList()
   },
   deactivated () {
     this.destroyDefaultProcessConfigSortable()
@@ -1684,8 +1686,29 @@ export default {
       const displayName = this.getRoleDisplayName(roleValue)
       return this.isBlankValue(displayName) ? '-' : displayName
     },
+    getSearchBuOptionList () {
+      return this.userBuList
+        .map(item => this.normalizeBuNo(item && item.buNo ? item.buNo : '', this.searchData.site))
+        .filter(item => !!item)
+    },
+    ensureSearchBuNoSelected () {
+      const buOptionList = this.getSearchBuOptionList()
+      if (buOptionList.length === 0) {
+        this.searchData.buNo = ''
+        return ''
+      }
+      const currentBuNo = this.normalizeBuNo(this.searchData.buNo, this.searchData.site)
+      if (currentBuNo && buOptionList.indexOf(currentBuNo) > -1) {
+        this.searchData.buNo = currentBuNo
+        return currentBuNo
+      }
+      // 需求要求查询BU必须有值：为空或无效时默认回退到首个可用BU。
+      this.searchData.buNo = buOptionList[0]
+      return this.searchData.buNo
+    },
     loadUserBuList () {
       if (this.userBuList.length > 0) {
+        this.ensureSearchBuNoSelected()
         this.ensureBuProcessConfigRows()
         return Promise.resolve(this.userBuList)
       }
@@ -1697,11 +1720,13 @@ export default {
             const buNo = item && item.buNo ? String(item.buNo).trim() : ''
             return excludedBuNoList.indexOf(buNo) === -1
           })
+          this.ensureSearchBuNoSelected()
           this.ensureBuProcessConfigRows()
         }
         return this.userBuList
       }).catch(() => {
         this.userBuList = []
+        this.ensureSearchBuNoSelected()
         this.ensureBuProcessConfigRows()
         return []
       })
@@ -1916,7 +1941,8 @@ export default {
       return this.normalizeBuNo(this.searchData.buNo, this.searchData.site)
     },
     handleSearchBuChange () {
-      // BU筛选变化（含清空）后立即重新查询，并回到第一页。
+      this.ensureSearchBuNoSelected()
+      // BU筛选变化后立即重新查询，并回到第一页。
       this.queryProcessColumns().then(() => {
         this.getDataList('Y')
       })
@@ -2976,7 +3002,6 @@ export default {
     resetSearch () {
       this.searchData.projectNo = ''
       this.searchData.projectDesc = ''
-      this.searchData.buNo = ''
       this.searchData.testPartNo = ''
       this.searchData.partDesc = ''
       this.searchData.dryWetType = ''
@@ -2985,6 +3010,7 @@ export default {
       this.searchData.projectPartSyncFlag = ''
       this.searchData.proofSyncFlag = ''
       this.searchData.proofingStatus = ''
+      this.ensureSearchBuNoSelected()
       this.queryProcessColumns().then(() => {
         this.getDataList('Y')
       })