diff --git a/bms-back/bms-system/src/main/java/com/bms/ar/domain/ArBillDetail.java b/bms-back/bms-system/src/main/java/com/bms/ar/domain/ArBillDetail.java
index 16b85456..f16c5606 100644
--- a/bms-back/bms-system/src/main/java/com/bms/ar/domain/ArBillDetail.java
+++ b/bms-back/bms-system/src/main/java/com/bms/ar/domain/ArBillDetail.java
@@ -34,6 +34,10 @@ public class ArBillDetail implements Serializable {
     private BigDecimal actualWeight;
     private BigDecimal volumeWeight;
     private BigDecimal chargeWeight;
+    /** 订单计费时命中的运费单价快照，对应 prc_order_bill.freight_rate。 */
+    private BigDecimal freightRate;
+    /** 订单计费时的标准处理费快照，对应 prc_order_bill.registration_fee。 */
+    private BigDecimal registrationFee;
     private BigDecimal pkgLength;
     private BigDecimal pkgWidth;
     private BigDecimal pkgHeight;
diff --git a/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java b/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java
index 63fe9b5a..889ce3bd 100644
--- a/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java
+++ b/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java
@@ -1142,6 +1142,8 @@ public class ArBillServiceImpl implements IArBillService {
         detail.setActualWeight(source.getActualWeight());
         detail.setVolumeWeight(source.getVolumeWeight());
         detail.setChargeWeight(source.getChargeWeight() == null ? source.getWeight() : source.getChargeWeight());
+        detail.setFreightRate(source.getFreightRate());
+        detail.setRegistrationFee(source.getRegistrationFee());
         detail.setPkgLength(source.getPkgLength());
         detail.setPkgWidth(source.getPkgWidth());
         detail.setPkgHeight(source.getPkgHeight());
@@ -1614,42 +1616,11 @@ public class ArBillServiceImpl implements IArBillService {
     }
 
     private BigDecimal exportUnitPrice(ArBillDetail detail) {
-        BigDecimal direct = firstFeeUnitPrice(detail.getFees());
-        if (direct != null) {
-            return direct;
-        }
-        BigDecimal freight = feeAmount(detail, "BASIC_FREIGHT");
-        if (freight == null || detail.getChargeWeight() == null || detail.getChargeWeight().compareTo(BigDecimal.ZERO) <= 0) {
-            return null;
-        }
-        return freight.divide(detail.getChargeWeight(), 4, java.math.RoundingMode.HALF_UP);
-    }
-
-    private BigDecimal firstFeeUnitPrice(List<ArBillDetailFee> fees) {
-        if (fees == null) {
-            return null;
-        }
-        for (ArBillDetailFee fee : fees) {
-            if (fee.getUnitPrice() != null) {
-                return fee.getUnitPrice();
-            }
-        }
-        return null;
+        return detail == null ? null : detail.getFreightRate();
     }
 
     private BigDecimal exportProcessingFee(ArBillDetail detail) {
-        BigDecimal total = BigDecimal.ZERO;
-        boolean found = false;
-        if (detail.getFees() != null) {
-            for (ArBillDetailFee fee : detail.getFees()) {
-                String name = fee.getFeeName() == null ? "" : fee.getFeeName();
-                if ("REGISTRATION_FEE".equalsIgnoreCase(fee.getFeeType()) || name.contains("处理费")) {
-                    total = total.add(nvl(fee.getAmount()));
-                    found = true;
-                }
-            }
-        }
-        return found ? total : null;
+        return detail == null ? null : detail.getRegistrationFee();
     }
 
     private String exportFormula(ArBillDetail detail) {
diff --git a/bms-back/bms-system/src/main/resources/mapper/ar/ArBillDetailMapper.xml b/bms-back/bms-system/src/main/resources/mapper/ar/ArBillDetailMapper.xml
index bb27940a..7aae0fd5 100644
--- a/bms-back/bms-system/src/main/resources/mapper/ar/ArBillDetailMapper.xml
+++ b/bms-back/bms-system/src/main/resources/mapper/ar/ArBillDetailMapper.xml
@@ -22,6 +22,8 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         <result property="actualWeight" column="actual_weight"/>
         <result property="volumeWeight" column="volume_weight"/>
         <result property="chargeWeight" column="charge_weight"/>
+        <result property="freightRate" column="freight_rate"/>
+        <result property="registrationFee" column="registration_fee"/>
         <result property="pkgLength" column="pkg_length"/>
         <result property="pkgWidth" column="pkg_width"/>
         <result property="pkgHeight" column="pkg_height"/>
@@ -35,7 +37,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     <select id="selectByBillId" parameterType="long" resultMap="ArBillDetailResult">
         select detail_id, ar_bill_id, prc_order_bill_id, detail_no, order_no, tracking_no, transfer_no, receive_time,
                product_code, product_name, goods_description, country_code, country_name, dest_postcode,
-               actual_weight, volume_weight, charge_weight, pkg_length, pkg_width, pkg_height,
+               actual_weight, volume_weight, charge_weight, freight_rate, registration_fee, pkg_length, pkg_width, pkg_height,
                currency, total_amount, remark, create_by, create_time
         from ar_bill_detail where ar_bill_id = #{arBillId} order by detail_no
     </select>
@@ -43,7 +45,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     <select id="selectByBillIdAndSourceIds" resultMap="ArBillDetailResult">
         select detail_id, ar_bill_id, prc_order_bill_id, detail_no, order_no, tracking_no, transfer_no, receive_time,
                product_code, product_name, goods_description, country_code, country_name, dest_postcode,
-               actual_weight, volume_weight, charge_weight, pkg_length, pkg_width, pkg_height,
+               actual_weight, volume_weight, charge_weight, freight_rate, registration_fee, pkg_length, pkg_width, pkg_height,
                currency, total_amount, remark, create_by, create_time
         from ar_bill_detail
         where ar_bill_id = #{arBillId}
@@ -79,7 +81,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     <select id="selectByBillIdWithFees" parameterType="long" resultMap="ArBillDetailWithFeesResult">
         select d.detail_id, d.ar_bill_id, d.prc_order_bill_id, d.detail_no, d.order_no, d.tracking_no, d.transfer_no, d.receive_time,
                d.product_code, d.product_name, d.goods_description, d.country_code, d.country_name, d.dest_postcode,
-               d.actual_weight, d.volume_weight, d.charge_weight, d.pkg_length, d.pkg_width, d.pkg_height,
+               d.actual_weight, d.volume_weight, d.charge_weight, d.freight_rate, d.registration_fee, d.pkg_length, d.pkg_width, d.pkg_height,
                d.currency, d.total_amount, d.remark, d.create_by, d.create_time,
                f.detail_fee_id as fee_detail_id, f.detail_id as fee_parent_detail_id,
                f.prc_income_bill_fee_id as fee_prc_income_bill_fee_id,
@@ -97,7 +99,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     <select id="selectExportPage" resultMap="ArBillDetailResult">
         select detail_id, ar_bill_id, prc_order_bill_id, detail_no, order_no, tracking_no, transfer_no, receive_time,
                product_code, product_name, goods_description, country_code, country_name, dest_postcode,
-               actual_weight, volume_weight, charge_weight, pkg_length, pkg_width, pkg_height,
+               actual_weight, volume_weight, charge_weight, freight_rate, registration_fee, pkg_length, pkg_width, pkg_height,
                currency, total_amount, remark, create_by, create_time
         from ar_bill_detail
         where ar_bill_id = #{arBillId} and detail_no &gt; #{lastDetailNo}
@@ -110,12 +112,12 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
                                     product_code,
                                     product_name, goods_description, country_code, country_name, dest_postcode,
                                     actual_weight,
-                                    volume_weight, charge_weight, pkg_length, pkg_width, pkg_height, currency,
+                                    volume_weight, charge_weight, freight_rate, registration_fee, pkg_length, pkg_width, pkg_height, currency,
                                     total_amount,
                                     remark, create_by, create_time)
         values (#{arBillId}, #{prcOrderBillId}, #{detailNo}, #{orderNo}, #{trackingNo}, #{transferNo}, #{receiveTime},
                 #{productCode}, #{productName}, #{goodsDescription}, #{countryCode}, #{countryName},
-                #{destPostcode}, #{actualWeight}, #{volumeWeight}, #{chargeWeight}, #{pkgLength}, #{pkgWidth},
+                #{destPostcode}, #{actualWeight}, #{volumeWeight}, #{chargeWeight}, #{freightRate}, #{registrationFee}, #{pkgLength}, #{pkgWidth},
                 #{pkgHeight}, #{currency}, #{totalAmount}, #{remark}, #{createBy}, sysdate())
     </insert>
 
@@ -123,14 +125,14 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         insert into ar_bill_detail (
             ar_bill_id, prc_order_bill_id, detail_no, order_no, tracking_no, transfer_no, receive_time, product_code,
             product_name, goods_description, country_code, country_name, dest_postcode, actual_weight,
-            volume_weight, charge_weight, pkg_length, pkg_width, pkg_height, currency, total_amount,
+            volume_weight, charge_weight, freight_rate, registration_fee, pkg_length, pkg_width, pkg_height, currency, total_amount,
             remark, create_by, create_time
         ) values
         <foreach collection="list" item="item" separator=",">
             (#{item.arBillId}, #{item.prcOrderBillId}, #{item.detailNo}, #{item.orderNo}, #{item.trackingNo},
              #{item.transferNo}, #{item.receiveTime}, #{item.productCode}, #{item.productName}, #{item.goodsDescription},
              #{item.countryCode}, #{item.countryName}, #{item.destPostcode}, #{item.actualWeight},
-             #{item.volumeWeight}, #{item.chargeWeight}, #{item.pkgLength}, #{item.pkgWidth}, #{item.pkgHeight},
+             #{item.volumeWeight}, #{item.chargeWeight}, #{item.freightRate}, #{item.registrationFee}, #{item.pkgLength}, #{item.pkgWidth}, #{item.pkgHeight},
              #{item.currency}, #{item.totalAmount}, #{item.remark}, #{item.createBy}, sysdate())
         </foreach>
     </insert>
diff --git a/bms-back/sql/20260930_add_ar_bill_detail_freight_rate.sql b/bms-back/sql/20260930_add_ar_bill_detail_freight_rate.sql
new file mode 100644
index 00000000..e58f8c24
--- /dev/null
+++ b/bms-back/sql/20260930_add_ar_bill_detail_freight_rate.sql
@@ -0,0 +1,17 @@
+-- 应收账单订单明细保留订单计费时实际命中的运费单价快照。
+ALTER TABLE `ar_bill_detail`
+    ADD COLUMN `freight_rate` decimal(10,4) DEFAULT NULL COMMENT '运费单价快照' AFTER `charge_weight`;
+
+ALTER TABLE `ar_bill_detail`
+    ADD COLUMN `registration_fee` decimal(10,2) DEFAULT NULL COMMENT '处理费快照' AFTER `freight_rate`;
+
+-- 回填已生成的历史应收账单，避免导出单价为空。
+UPDATE `ar_bill_detail` d
+INNER JOIN `prc_order_bill` p ON p.`bill_id` = d.`prc_order_bill_id`
+SET d.`freight_rate` = p.`freight_rate`
+WHERE d.`freight_rate` IS NULL;
+
+UPDATE `ar_bill_detail` d
+INNER JOIN `prc_order_bill` p ON p.`bill_id` = d.`prc_order_bill_id`
+SET d.`registration_fee` = p.`registration_fee`
+WHERE d.`registration_fee` IS NULL;
diff --git a/bms-back/sql/bms_init.sql b/bms-back/sql/bms_init.sql
index d020ac36..9dfcf62e 100644
--- a/bms-back/sql/bms_init.sql
+++ b/bms-back/sql/bms_init.sql
@@ -118,6 +118,8 @@ CREATE TABLE `ar_bill_detail` (
   `actual_weight` decimal(12,3) DEFAULT NULL COMMENT '实际重量KG',
   `volume_weight` decimal(12,3) DEFAULT NULL COMMENT '材积重量KG',
   `charge_weight` decimal(12,3) DEFAULT NULL COMMENT '计费重量KG',
+  `freight_rate` decimal(10,4) DEFAULT NULL COMMENT '运费单价快照',
+  `registration_fee` decimal(10,2) DEFAULT NULL COMMENT '处理费快照',
   `pkg_length` decimal(10,2) DEFAULT NULL COMMENT '长度CM',
   `pkg_width` decimal(10,2) DEFAULT NULL COMMENT '宽度CM',
   `pkg_height` decimal(10,2) DEFAULT NULL COMMENT '高度CM',