diff --git a/pages_goods/public/js/detail.js b/pages_goods/public/js/detail.js
index 30618aa..2f7ad34 100644
--- a/pages_goods/public/js/detail.js
+++ b/pages_goods/public/js/detail.js
@@ -249,7 +249,7 @@ export default {
 				}
 
 				// 优惠券
-				if (this.goodsSkuDetail.coupon_list) {
+				if (Array.isArray(this.goodsSkuDetail.coupon_list)) {
 					this.couponList = this.goodsSkuDetail.coupon_list;
 					this.couponList.forEach(v => {
 						if (v.count == v.lead_count) v.useState = 2;
diff --git a/pages_order/_components/common-payment/common-payment.vue b/pages_order/_components/common-payment/common-payment.vue
index 62fba90..fa13a7f 100644
--- a/pages_order/_components/common-payment/common-payment.vue
+++ b/pages_order/_components/common-payment/common-payment.vue
@@ -234,7 +234,7 @@
 						<view class="order-cell coupon" v-if="modules.indexOf('coupon') != -1">
 							<text class="tit">{{ $lang('order.payment.orderMoney.coupon') }}</text>
 							<view class="box text-overflow"@click="openSiteCoupon(calculateGoodsData.merch_id)">
-								<template v-if="orderCreateData.coupon[calculateGoodsData.merch_id].coupon_id">
+								<template v-if="(orderCreateData.coupon && orderCreateData.coupon[calculateGoodsData.merch_id] && orderCreateData.coupon[calculateGoodsData.merch_id].coupon_id)">
 									<text class="money price-font" style="max-width: 100%;">{{ $lang('order.payment.orderMoney.couponSelected', { count: 1 }) }}</text>
 								<!-- 	<text class="unit price-font">优惠</text>
 									<text class="money price-font">{{ (calculateData && calculateData.coupon_money ? calculateData.coupon_money : 0) | moneyFormat }}</text> -->
@@ -550,7 +550,7 @@
 											<view v-if="couponItem.type == 'discount' && couponItem.discount_limit > 0" class="limit">{{ $lang('order.payment.couponPopup.maxDiscount', { amount: couponItem.discount_limit }) }}</view>
 											<view class="time font-size-goods-tag">{{ $lang('order.payment.couponPopup.validPeriod') }}{{ couponItem.end_time ? $util.timeStampTurnTime(couponItem.end_time) : $lang('order.payment.couponPopup.permanentValid') }}</view>
 										</view>
-										<view class="iconfont" :class="selectCouponId == couponItem.coupon_id ? 'icon-yuan_checked color-base-text' : 'icon-yuan_checkbox'"></view>
+										<view class="iconfont" :class="selectCouponMap[merchCoupon.merch_id] == couponItem.coupon_id ? 'icon-yuan_checked color-base-text' : 'icon-yuan_checkbox'"></view>
 									</view>
 								</view>
 							</view>
diff --git a/pages_order/_components/common-payment/payment.js b/pages_order/_components/common-payment/payment.js
index cdb8d3a..526091a 100644
--- a/pages_order/_components/common-payment/payment.js
+++ b/pages_order/_components/common-payment/payment.js
@@ -55,7 +55,8 @@ export default {
 				merch_id: 0,
 				data: []
 			},
-			selectCouponId:0
+			// 按 merch_id 隔离,避免多商户之间互相污染
+			selectCouponMap: {}
 		}
 	},
 	inject: ['promotion'],
@@ -85,7 +86,7 @@ export default {
 		goodsData() {
 			if (this.paymentData) {
 				this.paymentData.goods_list.forEach(item => {
-					if (item.sku_spec_format) item.sku_spec_format = JSON.parse(item.sku_spec_format);
+					if (item.sku_spec_format && typeof item.sku_spec_format === 'string') item.sku_spec_format = JSON.parse(item.sku_spec_format);
 				})
 				return this.paymentData;
 			}
@@ -93,7 +94,7 @@ export default {
 		calculateGoodsData() {
 			if (this.calculateData) {
 				this.calculateData.goods_list.forEach(item => {
-					if (item.sku_spec_format) item.sku_spec_format = JSON.parse(item.sku_spec_format);
+					if (item.sku_spec_format && typeof item.sku_spec_format === 'string') item.sku_spec_format = JSON.parse(item.sku_spec_format);
 				})
 				return this.calculateData;
 			}
@@ -189,7 +190,7 @@ export default {
 		//多商户商品分类
 		goodsSpecFormat(goods_list){
 			goods_list.forEach(item => {
-				if (item.sku_spec_format) item.sku_spec_format = JSON.parse(item.sku_spec_format);
+				if (item.sku_spec_format && typeof item.sku_spec_format === 'string') item.sku_spec_format = JSON.parse(item.sku_spec_format);
 			})
 			return goods_list
 		},
@@ -249,7 +250,11 @@ export default {
 						this.modules = data.modules;
 						
 						//记录多商户优惠券
-						this.orderCreateData.coupon = data.coupon
+						// 兜底为对象,避免后续被当作数组处理
+						if (!data.coupon || typeof data.coupon !== 'object' || Array.isArray(data.coupon)) {
+							data.coupon = {};
+						}
+						this.orderCreateData.coupon = data.coupon;
 						
 						//查询优惠券
 						this.getCouponList();
@@ -365,7 +370,17 @@ export default {
 							}
 						});
 						//多商户
-						this.orderCreateData.coupon = res.data.coupon
+						// 保留用户已选的 coupon_id,后端回传的 res.data.coupon 默认都是 0 会覆盖掉
+						const prevCoupon = (this.orderCreateData.coupon && typeof this.orderCreateData.coupon === 'object' && !Array.isArray(this.orderCreateData.coupon)) ? this.orderCreateData.coupon : {};
+						this.orderCreateData.coupon = res.data.coupon || {};
+						if (this.orderCreateData.coupon && typeof this.orderCreateData.coupon === 'object' && !Array.isArray(this.orderCreateData.coupon)) {
+							Object.keys(prevCoupon).forEach(merch_id => {
+								const chosen = prevCoupon[merch_id] && prevCoupon[merch_id].coupon_id;
+								if (chosen && (!this.orderCreateData.coupon[merch_id] || !this.orderCreateData.coupon[merch_id].coupon_id)) {
+									this.orderCreateData.coupon[merch_id] = { coupon_id: chosen };
+								}
+							});
+						}
 						// if (!res.data.coupon_id) this.orderCreateData.coupon.coupon_id = 0;
 						// else this.orderCreateData.coupon.coupon_id = res.data.coupon_id;
 
@@ -731,44 +746,52 @@ export default {
 			this.tempData = null;
 		},
 		//优惠券单独多商户
-		/**
-		 * 显示店铺优惠券信息
-		 * @param {Object} siteId
-		 * @param {Object} couponData
-		 */
-		openSiteCoupon(merch_id) {
-		
-			this.tempData = this.$util.deepClone(this.orderCreateData);
-			this.merchCoupon.merch_id = merch_id;
-			this.selectCouponId = this.orderCreateData.coupon[merch_id].coupon_id;
-			// this.selectCouponMoney = this.orderCreateData.coupon[siteId].coupon_money;
-		
-			this.merchCoupon.data = this.coupon_list[merch_id];
-			this.$refs.couponPopup.open();
-			this.$forceUpdate();
-		},
-		/**商户选择券*/
-		selectCoupon(data,merch_id) {
-		
-			// if (this.orderCreateData.coupon[merch_id].coupon_id == data.coupon_id){
-			// 	this.orderCreateData.coupon[merch_id].coupon_id = 0
-			// }else{
-			// 	this.orderCreateData.coupon[merch_id].coupon_id = data.coupon_id
-			// };
-			if (this.selectCouponId != data.coupon_id) {
-				this.selectCouponId = data.coupon_id;
-			} else {
-				this.selectCouponId = 0;
-			}
-			this.$forceUpdate();
-			// this.orderCreateData.coupon[merch_id].coupon_id = data.coupon_id
-		},
-		//确定使用优惠券
-		useCpopon() {
-			this.orderCreateData.coupon[this.merchCoupon.merch_id].coupon_id = this.selectCouponId;
-			this.$refs.couponPopup.close();
-			this.calculate();
-		},
+	/**
+	 * 显示店铺优惠券信息
+	 * @param {Object} siteId
+	 * @param {Object} couponData
+	 */
+	openSiteCoupon(merch_id) {
+
+		this.tempData = this.$util.deepClone(this.orderCreateData);
+		this.merchCoupon.merch_id = merch_id;
+		// 从当前订单已选的 coupon_id 取值,没有则取弹窗里缓存的,再没有为 0
+		const exist = this.orderCreateData.coupon && this.orderCreateData.coupon[merch_id];
+		const cached = this.selectCouponMap[merch_id] || 0;
+		this.selectCouponMap[merch_id] = exist ? (exist.coupon_id || 0) : cached;
+		// this.selectCouponMoney = this.orderCreateData.coupon[siteId].coupon_money;
+
+		// 兜底: 列表为空时给一个空数组,弹窗不会渲染空指针
+		this.merchCoupon.data = (this.coupon_list && this.coupon_list[merch_id]) || [];
+		this.$refs.couponPopup.open();
+		this.$forceUpdate();
+	},
+	/**商户选择券*/
+	selectCoupon(data, merch_id) {
+
+		// if (this.orderCreateData.coupon[merch_id].coupon_id == data.coupon_id){
+		// 	this.orderCreateData.coupon[merch_id].coupon_id = 0
+		// }else{
+		// 	this.orderCreateData.coupon[merch_id].coupon_id = data.coupon_id
+		// };
+		const cur = this.selectCouponMap[merch_id] || 0;
+		this.selectCouponMap[merch_id] = (cur != data.coupon_id) ? data.coupon_id : 0;
+		this.$forceUpdate();
+		// this.orderCreateData.coupon[merch_id].coupon_id = data.coupon_id
+	},
+	//确定使用优惠券
+	useCpopon() {
+		const merch_id = this.merchCoupon.merch_id;
+		// 确保 orderCreateData.coupon 是对象结构,后端按 merch_id 取值
+		if (!this.orderCreateData.coupon || typeof this.orderCreateData.coupon !== 'object' || Array.isArray(this.orderCreateData.coupon)) {
+			this.orderCreateData.coupon = {};
+		}
+		this.orderCreateData.coupon[merch_id] = {
+			coupon_id: this.selectCouponMap[merch_id] || 0
+		};
+		this.$refs.couponPopup.close();
+		this.calculate();
+	},
 		
 		//-------------------
 		/**