diff --git a/apps/mini-user/src/pages/order-confirm/index.tsx b/apps/mini-user/src/pages/order-confirm/index.tsx
index 5213ddb..eb63ffc 100644
--- a/apps/mini-user/src/pages/order-confirm/index.tsx
+++ b/apps/mini-user/src/pages/order-confirm/index.tsx
@@ -42,6 +42,9 @@ type OrderPreview = {
   payAmount: number;
   benefitAmount: number;
   city?: { localMinQty: number; crossMinQty: number };
+  quantityOk?: boolean;
+  quantityMessage?: string | null;
+  minQty?: number;
 };
 
 function formatAddress(a: Address) {
@@ -53,7 +56,7 @@ export default function OrderConfirmPage() {
   const checkoutCtx = readCheckoutContext(router.params);
   const productId = checkoutCtx.productId ?? '';
   const forceCross = checkoutCtx.cross === true;
-  const [quantity, setQuantity] = useState(Math.max(2, Number(checkoutCtx.qty || 2)));
+  const [quantity, setQuantity] = useState(Math.max(1, Number(checkoutCtx.qty || 2)));
   const [addresses, setAddresses] = useState<Address[]>([]);
   const [addressId, setAddressId] = useState(checkoutCtx.addressId || '');
   const [preview, setPreview] = useState<OrderPreview | null>(null);
@@ -91,7 +94,7 @@ export default function OrderConfirmPage() {
       .then((data) => {
         if (!cancelled) {
           setPreview(data);
-          setMsg('');
+          setMsg(data.quantityOk === false ? (data.quantityMessage || '') : '');
         }
       })
       .catch((e) => {
@@ -115,18 +118,14 @@ export default function OrderConfirmPage() {
   );
 
   const isCross = forceCross || preview?.deliveryType === 'CROSS_CITY';
-  const minQty = isCross ? (preview?.city?.crossMinQty ?? 6) : (preview?.city?.localMinQty ?? 2);
+  const minQty =
+    preview?.minQty ??
+    (isCross ? (preview?.city?.crossMinQty ?? 6) : (preview?.city?.localMinQty ?? 2));
+  const quantityOk = preview ? preview.quantityOk !== false && quantity >= minQty : false;
+  const canSubmit = !!addressId && !!preview && quantityOk && !loading && !previewLoading;
 
   function updateQuantity(next: number) {
-    if (next < minQty) {
-      setMsg(
-        !isCross
-          ? `同城配送至少购买 ${minQty} 瓶`
-          : `跨城配送至少购买 ${minQty} 瓶（1箱）`,
-      );
-      return;
-    }
-    setMsg('');
+    if (next < 1) return;
     setQuantity(next);
   }
 
@@ -158,8 +157,18 @@ export default function OrderConfirmPage() {
   }
 
   async function submit() {
-    if (!addressId) {
-      setMsg('请选择收货地址');
+    if (!canSubmit) {
+      if (!addressId) {
+        setMsg('请选择收货地址');
+        return;
+      }
+      if (!quantityOk) {
+        setMsg(
+          isCross
+            ? `跨城配送至少购买 ${minQty} 瓶（1箱）`
+            : `同城配送至少购买 ${minQty} 瓶`,
+        );
+      }
       return;
     }
 
@@ -206,6 +215,13 @@ export default function OrderConfirmPage() {
   }
 
   const productImage = preview?.product ? getProductMainImage(preview.product) : '';
+  const submitLabel = loading
+    ? '提交中…'
+    : !addressId
+      ? '请选择地址'
+      : !quantityOk
+        ? `至少购买 ${minQty} 瓶`
+        : '提交订单';
 
   return (
     <PageShell variant="sub" className="order-confirm-page" hasFixedFooter>
@@ -241,7 +257,8 @@ export default function OrderConfirmPage() {
         {isCross ? (
           <View className="order-card">
             <Text className="u-muted">
-              该地址超出同城配送范围，将由总部物流发货，运费到付。
+              该地址超出同城配送范围，将由总部物流发货，运费到付
+              {quantity < minQty ? `；跨城至少购买 ${minQty} 瓶（1箱）` : ''}。
             </Text>
           </View>
         ) : null}
@@ -269,7 +286,7 @@ export default function OrderConfirmPage() {
                 <Text>购买数量</Text>
                 <View className="order-qty-controls">
                   <View
-                    className="order-qty-btn"
+                    className={`order-qty-btn${quantity <= 1 ? ' order-qty-btn--disabled' : ''}`}
                     onClick={() => updateQuantity(quantity - 1)}
                   >
                     <Text>−</Text>
@@ -283,6 +300,13 @@ export default function OrderConfirmPage() {
                   </View>
                 </View>
               </View>
+              {!quantityOk ? (
+                <Text className="order-qty-hint">
+                  {isCross
+                    ? `跨城配送至少购买 ${minQty} 瓶（1箱），请调整数量`
+                    : `同城配送至少购买 ${minQty} 瓶，请调整数量`}
+                </Text>
+              ) : null}
             </View>
 
             <View className="order-card">
@@ -320,10 +344,13 @@ export default function OrderConfirmPage() {
           </Text>
         </View>
         <View
-          className="order-confirm-submit"
-          onClick={() => !loading && void submit()}
+          className={`order-confirm-submit${canSubmit ? '' : ' order-confirm-submit--disabled'}`}
+          onClick={() => {
+            if (!canSubmit) return;
+            void submit();
+          }}
         >
-          <Text>{loading ? '提交中…' : !addressId ? '请选择地址' : '提交订单'}</Text>
+          <Text>{submitLabel}</Text>
         </View>
       </View>
     </PageShell>
diff --git a/apps/mini-user/src/styles/order.css b/apps/mini-user/src/styles/order.css
index 5e0eed8..4f64095 100644
--- a/apps/mini-user/src/styles/order.css
+++ b/apps/mini-user/src/styles/order.css
@@ -93,6 +93,11 @@
   color: var(--color-on-surface);
 }
 
+.order-qty-btn--disabled {
+  opacity: 0.4;
+  pointer-events: none;
+}
+
 .order-qty-value {
   margin: 0 14px;
   font-size: 16px;
@@ -101,6 +106,14 @@
   text-align: center;
 }
 
+.order-qty-hint {
+  display: block;
+  margin-top: 10px;
+  font-size: 13px;
+  color: var(--color-heritage-red);
+  line-height: 1.4;
+}
+
 .order-row {
   display: flex;
   justify-content: space-between;
@@ -180,6 +193,13 @@
   justify-content: center;
 }
 
+.order-confirm-submit--disabled {
+  background: #c9c5c0;
+  color: #fff;
+  opacity: 0.85;
+  pointer-events: none;
+}
+
 .order-tabs {
   display: flex;
   padding: 0 var(--space-page);
diff --git a/server/dukang-api/src/modules/trade/trade.service.ts b/server/dukang-api/src/modules/trade/trade.service.ts
index ffcce37..59dbb1d 100644
--- a/server/dukang-api/src/modules/trade/trade.service.ts
+++ b/server/dukang-api/src/modules/trade/trade.service.ts
@@ -75,7 +75,6 @@ export class TradeService {
       city.localMinQty,
       city.crossMinQty,
     );
-    if (!check.ok) throw new BadRequestException(check.message);
 
     const unitPrice = Number(product.price);
     const productAmount = unitPrice * body.quantity;
@@ -96,6 +95,10 @@ export class TradeService {
       payAmount: productAmount,
       benefitAmount: benefitPerUnit * body.quantity,
       city: serializeBigInt(city),
+      /** 起购未满足时仍返回预览，供确认页改数量；下单接口仍会硬校验 */
+      quantityOk: check.ok,
+      quantityMessage: check.ok ? null : (check.message ?? null),
+      minQty: deliveryType === 'LOCAL' ? city.localMinQty : city.crossMinQty,
     };
   }
 
@@ -110,6 +113,9 @@ export class TradeService {
     req: Request,
   ) {
     const preview = await this.preview(userId, body);
+    if (preview.quantityOk === false) {
+      throw new BadRequestException(preview.quantityMessage || '购买数量不满足起购要求');
+    }
     const address = await this.prisma.userAddress.findFirst({
       where: { id: BigInt(body.addressId), userId },
     });