diff --git a/backend/app/services/order/AfterSaleServices.php b/backend/app/services/order/AfterSaleServices.php
index 705956755..1d6435fcf 100644
--- a/backend/app/services/order/AfterSaleServices.php
+++ b/backend/app/services/order/AfterSaleServices.php
@@ -760,8 +760,8 @@ class AfterSaleServices extends BaseService
         if ($targets['has_integral']) {
             $fields = $this->appendRefundIntegralField($fields);
         }
-        // 纯积分订单（无现金可退）：移除"申请退款金额"字段
-        if (!$targets['has_cash'] && $targets['has_integral']) {
+        // 无现金可退（纯积分或 0 元单）：移除"申请退款金额"字段，避免必填 0 金额干扰申请
+        if (!$targets['has_cash']) {
             $fields = $this->removeRefundPriceField($fields);
         }
         $config['fields'] = $fields;
@@ -1249,9 +1249,14 @@ class AfterSaleServices extends BaseService
                 && ((float)$maxRefundPrice <= 0 || (int)($center['use_integral_num'] ?? 0) > 0)) {
                 $refundIntegral = $maxRefundIntegral;
             }
+            // 0 元单（无现金、无积分可退）：未传金额时按 0 落库，仍走售后闭环（库存/状态）
+            if ($refundPrice <= 0 && (float)$maxRefundPrice <= 0) {
+                $refundPrice = 0.0;
+            }
 
-            // 退款金额与退还积分至少一项大于 0
-            if ($refundPrice <= 0 && $refundIntegral <= 0) {
+            // 存在可退现金或积分时，至少一项须大于 0；两侧上限均为 0 时允许 0 退款
+            if ($refundPrice <= 0 && $refundIntegral <= 0
+                && ((float)$maxRefundPrice > 0 || $maxRefundIntegral > 0)) {
                 throw new \RuntimeException('退款金额或退还积分至少一项必须大于 0');
             }
             if ($refundPrice > (float)$maxRefundPrice) {
diff --git a/backend/app/services/order/RefundOrderServices.php b/backend/app/services/order/RefundOrderServices.php
index 86d896270..0c733303a 100644
--- a/backend/app/services/order/RefundOrderServices.php
+++ b/backend/app/services/order/RefundOrderServices.php
@@ -539,7 +539,14 @@ class RefundOrderServices extends BaseService
             && (int)($afterSale['receive_time'] ?? 0) <= 0) {
             throw new \RuntimeException('请先确认收到退货再执行退款');
         }
-        if (bccomp($amount, '0.00', 2) < 0 || ((int)($afterSale['refund_integral'] ?? 0) <= 0 && bccomp($amount, '0.00', 2) <= 0)) {
+        if (bccomp($amount, '0.00', 2) < 0) {
+            throw new \RuntimeException('退款金额不能为负数');
+        }
+        // 0 元售后（申请金额与退还积分均为 0）允许实退 0，走本地退款闭环；有可退现金却实退 0 仍拦截
+        $hasCash = bccomp($amount, '0.00', 2) > 0;
+        $hasIntegral = (int)($afterSale['refund_integral'] ?? 0) > 0;
+        if (!$hasCash && !$hasIntegral
+            && bccomp((string)($afterSale['refund_price'] ?? '0.00'), '0.00', 2) > 0) {
             throw new \RuntimeException('退款金额或退款积分必须大于零');
         }
         if (bccomp($amount, (string)($afterSale['refund_price'] ?? '0.00'), 2) > 0) {
diff --git a/frontend/admin/src/pages/order/afterSale/detail.vue b/frontend/admin/src/pages/order/afterSale/detail.vue
index b6e47ac80..d7318ca78 100644
--- a/frontend/admin/src/pages/order/afterSale/detail.vue
+++ b/frontend/admin/src/pages/order/afterSale/detail.vue
@@ -348,11 +348,11 @@
         <el-form-item label="可退金额">
           <span class="price">¥{{ detail.refund_price || '0.00' }}</span>
         </el-form-item>
-        <el-form-item label="退款金额" required>
+        <el-form-item label="退款金额" :required="Number(detail.refund_price) > 0">
           <el-input-number
             v-model="refundForm.amount"
-            :min="0.01"
-            :max="Number(detail.refund_price) || 0"
+            :min="Number(detail.refund_price) > 0 ? 0.01 : 0"
+            :max="Math.max(Number(detail.refund_price) || 0, 0)"
             :precision="2"
             style="width: 200px"
           ></el-input-number>
@@ -676,7 +676,15 @@ function openRefund() {
  * 提交退款
  */
 function submitRefund() {
-  if (refundForm.value.amount <= 0) {
+  const amount = Number(refundForm.value.amount) || 0;
+  const maxCash = Number(detail.value.refund_price) || 0;
+  const refundIntegral = Number(detail.value.refund_integral) || 0;
+  // 有可退现金时金额须 > 0；0 元单（无现金、可无积分）允许实退 0
+  if (amount < 0) {
+    ElMessage.warning('退款金额不能为负数');
+    return;
+  }
+  if (amount <= 0 && refundIntegral <= 0 && maxCash > 0) {
     ElMessage.warning('退款金额必须大于0');
     return;
   }