diff --git a/frontend/src/views/desktop/MiniBusiness.vue b/frontend/src/views/desktop/MiniBusiness.vue
index 8a7c0bd..84fcd1c 100644
--- a/frontend/src/views/desktop/MiniBusiness.vue
+++ b/frontend/src/views/desktop/MiniBusiness.vue
@@ -144,6 +144,7 @@ function openEdit(item: any) {
 async function handleSave() {
     if (!form.value.customer_id) { ElMessage.warning('请选择客户单位'); return }
   try {
+    if (form.value.status === '已流失') form.value.expected_revenue_date = ''
     if (dialogMode.value === 'create') {
       await api.post('/mini-business/', form.value)
     } else {
@@ -205,7 +206,9 @@ async function handleDeleteLog(logId: string) {
 async function quickStatusChange(row: any, newStatus: string) {
   try {
     await ElMessageBox.confirm(`确定将状态改为「${newStatus}」？`, '确认', { type: 'warning', confirmButtonText: '确定', cancelButtonText: '取消' })
-    await api.put(`/mini-business/${row.id}`, { status: newStatus })
+    const payload: any = { status: newStatus }
+    if (newStatus === '已流失') payload.expected_revenue_date = ''
+    await api.put(`/mini-business/${row.id}`, payload)
     ElMessage.success('状态已更新')
     await loadItems()
   } catch (e: any) {
diff --git a/frontend/src/views/mobile/MiniBusinessForm.vue b/frontend/src/views/mobile/MiniBusinessForm.vue
index 0fcbe54..663d78f 100644
--- a/frontend/src/views/mobile/MiniBusinessForm.vue
+++ b/frontend/src/views/mobile/MiniBusinessForm.vue
@@ -78,6 +78,7 @@ async function handleQuickCreate() {
 
 async function handleSubmit() {
   if (!form.value.customer_id) { ElMessage.warning('请选择客户'); return }
+  if (form.value.status === '已流失') form.value.expected_revenue_date = ''
   submitLoading.value = true
   try {
     if (isEdit.value) {