diff --git a/src/components/PaymentCountdown.md b/src/components/PaymentCountdown.md
index abe4137..b4c7d9a 100644
--- a/src/components/PaymentCountdown.md
+++ b/src/components/PaymentCountdown.md
@@ -1,6 +1,6 @@
 # PaymentCountdown 支付倒计时组件
 
-基于订单创建时间的支付倒计时组件，支持静态显示和实时更新两种模式。
+基于订单过期时间（`expirationTime`）的支付倒计时组件，支持静态显示和实时更新两种模式。
 
 ## 功能特性
 
@@ -19,7 +19,7 @@ import PaymentCountdown from '@/components/PaymentCountdown';
 
 // 订单列表页 - 静态显示
 <PaymentCountdown
-  createTime={order.createTime}
+  expirationTime={order.expirationTime}
   payStatus={order.payStatus}
   realTime={false}
   mode="badge"
@@ -27,7 +27,7 @@ import PaymentCountdown from '@/components/PaymentCountdown';
 
 // 订单详情页 - 实时更新
 <PaymentCountdown
-  createTime={order.createTime}
+  expirationTime={order.expirationTime}
   payStatus={order.payStatus}
   realTime={true}
   showSeconds={true}
@@ -43,7 +43,7 @@ import PaymentCountdown from '@/components/PaymentCountdown';
 ```tsx
 // 自定义超时时间（12小时）
 <PaymentCountdown
-  createTime={order.createTime}
+  expirationTime={order.expirationTime}
   payStatus={order.payStatus}
   realTime={true}
   timeoutHours={12}
@@ -55,7 +55,7 @@ import PaymentCountdown from '@/components/PaymentCountdown';
 
 // 纯文本模式
 <PaymentCountdown
-  createTime={order.createTime}
+  expirationTime={order.expirationTime}
   payStatus={order.payStatus}
   realTime={false}
   mode="text"
@@ -67,6 +67,7 @@ import PaymentCountdown from '@/components/PaymentCountdown';
 | 参数 | 类型 | 默认值 | 说明 |
 |------|------|--------|------|
 | createTime | string | - | 订单创建时间 |
+| expirationTime | string | - | 订单过期时间（推荐） |
 | payStatus | boolean | false | 支付状态 |
 | realTime | boolean | false | 是否实时更新 |
 | timeoutHours | number | 24 | 超时小时数 |
@@ -102,12 +103,13 @@ import PaymentCountdown from '@/components/PaymentCountdown';
 import { usePaymentCountdown, formatCountdownText } from '@/hooks/usePaymentCountdown';
 
 const MyComponent = ({ order }) => {
-  const timeLeft = usePaymentCountdown(
-    order.createTime,
-    order.payStatus,
-    true, // 实时更新
-    24    // 24小时超时
-  );
+  const timeLeft = usePaymentCountdown({
+    expirationTime: order.expirationTime,
+    createTime: order.createTime, // expirationTime 缺失时回退
+    payStatus: order.payStatus,
+    realTime: true,
+    timeoutHours: 24
+  });
 
   const countdownText = formatCountdownText(timeLeft, true);
 
diff --git a/src/components/PaymentCountdown.tsx b/src/components/PaymentCountdown.tsx
index 447c2c2..2d6048e 100644
--- a/src/components/PaymentCountdown.tsx
+++ b/src/components/PaymentCountdown.tsx
@@ -11,6 +11,8 @@ import './PaymentCountdown.scss';
 export interface PaymentCountdownProps {
   /** 订单创建时间 */
   createTime?: string;
+  /** 订单过期时间（推荐直接传后端返回的 expirationTime） */
+  expirationTime?: string;
   /** 支付状态 */
   payStatus?: boolean;
   /** 是否实时更新（详情页用true，列表页用false） */
@@ -29,6 +31,7 @@ export interface PaymentCountdownProps {
 
 const PaymentCountdown: React.FC<PaymentCountdownProps> = ({
   createTime,
+  expirationTime,
   payStatus = false,
   realTime = false,
   timeoutHours = 24,
@@ -37,10 +40,16 @@ const PaymentCountdown: React.FC<PaymentCountdownProps> = ({
   onExpired,
   mode = 'badge'
 }) => {
-  const timeLeft = usePaymentCountdown(createTime, payStatus, realTime, timeoutHours);
+  const timeLeft = usePaymentCountdown({
+    createTime,
+    expirationTime,
+    payStatus,
+    realTime,
+    timeoutHours
+  });
 
-  // 如果已支付或没有创建时间，不显示倒计时
-  if (payStatus || !createTime) {
+  // 如果已支付或没有可计算的截止时间，不显示倒计时
+  if (payStatus || (!expirationTime && !createTime)) {
     return null;
   }
 
diff --git a/src/hooks/usePaymentCountdown.ts b/src/hooks/usePaymentCountdown.ts
index a4caa5f..0377f65 100644
--- a/src/hooks/usePaymentCountdown.ts
+++ b/src/hooks/usePaymentCountdown.ts
@@ -13,19 +13,30 @@ export interface CountdownTime {
   totalMinutes: number; // 总剩余分钟数
 }
 
+export interface UsePaymentCountdownParams {
+  /** 订单创建时间（用于兼容：当 expirationTime 缺失时按 createTime + timeoutHours 计算） */
+  createTime?: string;
+  /** 订单过期时间（推荐直接传后端返回的 expirationTime） */
+  expirationTime?: string;
+  /** 支付状态 */
+  payStatus?: boolean;
+  /** 是否实时更新（详情页用true，列表页用false） */
+  realTime?: boolean;
+  /** 超时小时数，默认24小时（仅在 expirationTime 缺失时生效） */
+  timeoutHours?: number;
+}
+
 /**
  * 支付倒计时Hook
- * @param createTime 订单创建时间
- * @param payStatus 支付状态
- * @param realTime 是否实时更新（详情页用true，列表页用false）
- * @param timeoutHours 超时小时数，默认24小时
+ * 优先使用 expirationTime；当 expirationTime 缺失时回退到 createTime + timeoutHours。
  */
-export const usePaymentCountdown = (
-  createTime?: string,
-  payStatus?: boolean,
-  realTime: boolean = false,
-  timeoutHours: number = 24
-): CountdownTime => {
+export const usePaymentCountdown = ({
+  createTime,
+  expirationTime,
+  payStatus,
+  realTime = false,
+  timeoutHours = 24
+}: UsePaymentCountdownParams): CountdownTime => {
   const [timeLeft, setTimeLeft] = useState<CountdownTime>({
     hours: 0,
     minutes: 0,
@@ -37,7 +48,7 @@ export const usePaymentCountdown = (
   // 计算剩余时间的函数
   const calculateTimeLeft = useMemo(() => {
     return (): CountdownTime => {
-      if (!createTime || payStatus) {
+      if (payStatus || (!expirationTime && !createTime)) {
         return {
           hours: 0,
           minutes: 0,
@@ -47,8 +58,27 @@ export const usePaymentCountdown = (
         };
       }
 
-      const createTimeObj = dayjs(createTime);
-      const expireTime = createTimeObj.add(timeoutHours, 'hour');
+      // 优先使用后端过期时间；如果无法解析，再回退到 createTime + timeoutHours
+      const expireTimeFromExpiration = expirationTime ? dayjs(expirationTime) : null;
+      const expireTimeFromCreate =
+        createTime ? dayjs(createTime).add(timeoutHours, 'hour') : null;
+      const expireTime =
+        expireTimeFromExpiration?.isValid()
+          ? expireTimeFromExpiration
+          : expireTimeFromCreate?.isValid()
+            ? expireTimeFromCreate
+            : null;
+
+      if (!expireTime) {
+        return {
+          hours: 0,
+          minutes: 0,
+          seconds: 0,
+          isExpired: true,
+          totalMinutes: 0
+        };
+      }
+
       const now = dayjs();
       const diff = expireTime.diff(now);
 
@@ -76,10 +106,10 @@ export const usePaymentCountdown = (
         totalMinutes
       };
     };
-  }, [createTime, payStatus, timeoutHours]);
+  }, [createTime, expirationTime, payStatus, timeoutHours]);
 
   useEffect(() => {
-    if (!createTime || payStatus) {
+    if (payStatus || (!expirationTime && !createTime)) {
       setTimeLeft({
         hours: 0,
         minutes: 0,
@@ -111,7 +141,7 @@ export const usePaymentCountdown = (
     }, 1000);
 
     return () => clearInterval(timer);
-  }, [createTime, payStatus, realTime, calculateTimeLeft]);
+  }, [createTime, expirationTime, payStatus, realTime, calculateTimeLeft]);
 
   return timeLeft;
 };
diff --git a/src/shop/orderDetail/index.tsx b/src/shop/orderDetail/index.tsx
index 6350bcb..14ee4db 100644
--- a/src/shop/orderDetail/index.tsx
+++ b/src/shop/orderDetail/index.tsx
@@ -175,6 +175,7 @@ const OrderDetail = () => {
       {!order.payStatus && order.orderStatus !== 2 && (
         <div className="order-detail-countdown flex justify-center p-4 border-b border-gray-50">
           <PaymentCountdown
+            expirationTime={order.expirationTime}
             createTime={order.createTime}
             payStatus={order.payStatus}
             realTime={true}
diff --git a/src/user/order/components/OrderList.tsx b/src/user/order/components/OrderList.tsx
index 7f6eb09..ce06b16 100644
--- a/src/user/order/components/OrderList.tsx
+++ b/src/user/order/components/OrderList.tsx
@@ -733,6 +733,7 @@ function OrderList(props: OrderListProps) {
                         <View className={`${getOrderStatusColor(item)} font-medium`}>
                           {!item.payStatus && item.orderStatus !== 2 ? (
                             <PaymentCountdown
+                              expirationTime={item.expirationTime}
                               createTime={item.createTime}
                               payStatus={item.payStatus}
                               realTime={false}