diff --git a/src/views/modules/order/poOrder.vue b/src/views/modules/order/poOrder.vue
index cff67ce..2bf5310 100644
--- a/src/views/modules/order/poOrder.vue
+++ b/src/views/modules/order/poOrder.vue
@@ -563,7 +563,46 @@
     </el-dialog>
 
     <!--
-      模态框 #4：供应商可供物料弹窗
+      模态框 #4：Buyer 选择弹窗
+      Buyer 数据按当前 Site + Customer 从 po_buyer 主数据获取，回填 buyer_code。
+    -->
+    <el-dialog
+      title="选择 Buyer"
+      v-drag
+      :visible.sync="buyerDialogVisible"
+      width="640px"
+      top="10vh"
+      append-to-body
+      :close-on-click-modal="false"
+      @closed="resetBuyerDialog">
+      <div style="margin-bottom: 10px; color: #606266;">
+        <span>Customer：{{ searchData.customer }}</span>
+      </div>
+      <el-table
+        ref="buyerSelectTable"
+        :data="buyerDialogRows"
+        :height="360"
+        border
+        stripe
+        highlight-current-row
+        v-loading="buyerDialogLoading"
+        empty-text="当前 Customer 未维护可用 Buyer"
+        @current-change="onBuyerDialogCurrentChange"
+        @row-dblclick="applyBuyerDialogSelection">
+        <el-table-column prop="code" label="Buyer 编码" min-width="180" header-align="center" align="center" />
+        <el-table-column prop="name" label="Buyer 名称" min-width="280" header-align="center" show-overflow-tooltip />
+      </el-table>
+      <div slot="footer" class="dialog-footer">
+        <el-button
+          type="primary"
+          :disabled="!buyerDialogSelectedRow"
+          @click="applyBuyerDialogSelection(buyerDialogSelectedRow)">确定</el-button>
+        <el-button @click="buyerDialogVisible = false">取消</el-button>
+      </div>
+    </el-dialog>
+
+    <!--
+      模态框 #5：供应商可供物料弹窗
       用途：
       1) 按供应商加载可供物料；
       2) 双击选中后回填 Part No / Item / SKU / Category。
@@ -658,7 +697,7 @@ import PoOrderAdvancedQuery from './com_poOrderAdvancedQuery.vue'
 import ComPoOrderCustomerPicker from './com_poOrder_CustomerPicker.vue'
 import ComPoOrderDynamicFieldRenderer from './com_poOrder_DynamicFieldRenderer.vue'
 
-const ADD_CHOOSER_FIELD_CODES = new Set(['supplier_name', 'part_no', 'departure', 'destination', 'ship_via'])
+const ADD_CHOOSER_FIELD_CODES = new Set(['buyer', 'supplier_name', 'part_no', 'departure', 'destination', 'ship_via'])
 const ADD_DISPLAY_ONLY_FIELD_CODES = new Set(['short_office', 'short_npc', 'item', 'category_name', 'sku', 'value', 'status', 'planner', 'crd_ori', 'base_price'])
 const ADD_TEXTAREA_FIELD_CODES = new Set(['remark'])
 const ADD_FULL_ROW_FIELD_CODES = new Set(['remark'])
@@ -843,6 +882,11 @@ export default {
       addDetailCurrentDraftId: '',
       addDetailEditingDraftId: '',
       addDetailDraftSeq: 0,
+      buyerDialogVisible: false,
+      buyerDialogLoading: false,
+      buyerDialogRows: [],
+      buyerDialogSelectedRow: null,
+      buyerDialogTarget: 'master',
       supplierPartDialogVisible: false,
       supplierPartDialogLoading: false,
       supplierPartDialogRows: [],
@@ -2301,7 +2345,9 @@ export default {
     },
     openAddChooserByField (field, target = 'master') {
       const code = this.getAddFieldCode(field)
-      if (code === 'supplier_name') {
+      if (code === 'buyer') {
+        this.openAddBuyerSelect(target)
+      } else if (code === 'supplier_name') {
         this.openAddSupplierSelect(target)
       } else if (code === 'part_no') {
         this.openAddPartNoSelect(target)
@@ -2315,6 +2361,7 @@ export default {
     },
     getAddChooserPlaceholder (field) {
       const code = this.getAddFieldCode(field)
+      if (code === 'buyer') return '请选择 Buyer'
       if (code === 'supplier_name') return '请选择供应商'
       if (code === 'part_no') return '请选择物料'
       if (code === 'departure') return '请选择始发港'
@@ -3261,14 +3308,19 @@ export default {
         if (data && data.code === 0) {
           this.poBuyerOptions = (data.rows || []).map(item => ({
             label: this.formatCodeOptionLabel(item.code, item.name),
-            value: item.code
+            value: item.code,
+            code: item.code,
+            name: item.name || ''
           }))
           this.columnSelectOptions.poBuyerOptions = this.poBuyerOptions
+          return this.poBuyerOptions
         } else {
-          this.$message.error(data.msg || '操作失败')
+          this.$message.error((data && data.msg) || '操作失败')
+          return []
         }
       }).catch(error => {
         this.$message.error('操作失败: ' + error.message)
+        return []
       })
     },
 
@@ -4154,6 +4206,63 @@ export default {
       })
     },
 
+    /**
+     * 打开 Buyer 选择弹窗。接口按当前 Site + Customer 查询 po_buyer，
+     * 因此弹窗不会混入其他 Customer 的 Buyer。
+     */
+    openAddBuyerSelect (target = 'master') {
+      const customer = String(this.searchData.customer || '').trim()
+      if (!customer) {
+        this.$message.warning('请先选择 Customer')
+        return
+      }
+      this.buyerDialogTarget = target === 'detail' ? 'detail' : 'master'
+      this.buyerDialogRows = []
+      this.buyerDialogSelectedRow = null
+      this.buyerDialogVisible = true
+      this.buyerDialogLoading = true
+      this.getBuyerOptions(customer).then(options => {
+        if (!this.buyerDialogVisible) {
+          return
+        }
+        this.buyerDialogRows = Array.isArray(options) ? options : []
+        const targetForm = this.getAddTargetForm(this.buyerDialogTarget)
+        const currentBuyer = String((targetForm && targetForm.buyer) || '').trim()
+        const selected = this.buyerDialogRows.find(row => row && row.code === currentBuyer) || null
+        this.buyerDialogSelectedRow = selected
+        this.$nextTick(() => {
+          if (this.$refs.buyerSelectTable && this.$refs.buyerSelectTable.setCurrentRow) {
+            this.$refs.buyerSelectTable.setCurrentRow(selected)
+          }
+        })
+      }).finally(() => {
+        this.buyerDialogLoading = false
+      })
+    },
+
+    onBuyerDialogCurrentChange (row) {
+      this.buyerDialogSelectedRow = row || null
+    },
+
+    /** Buyer 实际落库字段为 POHeader.buyer，因此回填主数据编码 buyer_code。 */
+    applyBuyerDialogSelection (row) {
+      if (!row || !row.code) {
+        return
+      }
+      const targetForm = this.getAddTargetForm(this.buyerDialogTarget)
+      if (targetForm) {
+        this.$set(targetForm, 'buyer', row.code)
+      }
+      this.buyerDialogVisible = false
+    },
+
+    resetBuyerDialog () {
+      this.buyerDialogLoading = false
+      this.buyerDialogRows = []
+      this.buyerDialogSelectedRow = null
+      this.buyerDialogTarget = 'master'
+    },
+
     openAddSupplierSelect (target = 'master') {
       const conSql = " and site = '" + this.$store.state.user.site + "'"
       const context = target === 'detail' ? 'addDetail' : 'add'