diff --git a/bms-front/src/views/ar/bill/components/GenerateBillDialog.vue b/bms-front/src/views/ar/bill/components/GenerateBillDialog.vue
index 38a9c294..d0b50226 100644
--- a/bms-front/src/views/ar/bill/components/GenerateBillDialog.vue
+++ b/bms-front/src/views/ar/bill/components/GenerateBillDialog.vue
@@ -318,6 +318,10 @@ function fetchPreview() {
     previewRows.value = res.rows || []
     previewTotal.value = Number(res.total) || 0
     previewTotalAmount.value = Number(res.totalAmount) || 0
+    // 查询到可生成订单后默认采用“全选查询结果”模式；如需排除订单，再通过排除入口维护。
+    selectionMode.value = previewTotal.value > 0
+      ? AR_BILL_SELECTION_MODE.ALL_MATCHED
+      : AR_BILL_SELECTION_MODE.EXPLICIT
     previewSearched.value = true
     nextTick(syncPageSelection)
   }).finally(() => {