diff --git a/firstleg/src/main/java/com/baiyue/firstleg/mapper/SmartLoadingCandidateMapper.java b/firstleg/src/main/java/com/baiyue/firstleg/mapper/SmartLoadingCandidateMapper.java
index e876d46d2..955715c40 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/mapper/SmartLoadingCandidateMapper.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/mapper/SmartLoadingCandidateMapper.java
@@ -15,7 +15,7 @@ import com.baiyue.firstleg.dto.SmartLoadingDtos.Candidate; import org.apache.iba
            WHERE o.inbound_role='MASTER'
                          AND split_item.tenant_id=o.tenant_id
                          AND split_item.parent_inbound_id=o.id
-           AND split_item.source_measurement_item_id=i.id),0) availablePackageCount,
+           AND split_item.source_inbound_detail_id=i.inbound_detail_id),0) availablePackageCount,
          COALESCE(o.actual_gross_weight_kg / NULLIF(o.total_package_count, 0), 0) unitGrossWeightKg,
          COALESCE(o.actual_net_weight_kg / NULLIF(o.total_package_count, 0), 0) unitNetWeightKg,
          COALESCE(i.unit_volume_cbm,0) unitVolumeCbm
@@ -24,11 +24,17 @@ import com.baiyue.firstleg.dto.SmartLoadingDtos.Candidate; import org.apache.iba
       AND m.status='APPROVED'
       AND m.id=(SELECT MAX(m2.id) FROM fl_inbound_measurement m2
                  WHERE m2.tenant_id=o.tenant_id AND m2.inbound_id=o.id AND m2.status='APPROVED')
-    JOIN fl_inbound_measurement_item i ON i.tenant_id=o.tenant_id AND i.measurement_id=m.id
+    JOIN (
+      SELECT tenant_id,measurement_id,inbound_detail_id,SUM(package_count) package_count,
+             COALESCE(SUM(COALESCE(total_volume_cbm,COALESCE(unit_volume_cbm,0)*package_count))
+               / NULLIF(SUM(package_count),0),0) unit_volume_cbm
+        FROM fl_inbound_measurement_item
+       WHERE inbound_detail_id IS NOT NULL AND package_count>0
+       GROUP BY tenant_id,measurement_id,inbound_detail_id
+    ) i ON i.tenant_id=o.tenant_id AND i.measurement_id=m.id
    WHERE o.warehouse_id=#{warehouseId} AND o.process_status='WAIT_SPLIT'
      AND o.actual_gross_weight_kg IS NOT NULL AND o.actual_net_weight_kg IS NOT NULL
      AND (o.inbound_role='MASTER' OR (o.split_purpose='REMAINDER' AND o.split_status='NOT_SPLIT'))
-     AND i.inbound_detail_id IS NOT NULL
      AND i.package_count>COALESCE((SELECT SUM(li.package_count) FROM fl_loading_plan_item li
        WHERE li.account_id=o.tenant_id AND li.inbound_id=o.id
          AND li.inbound_detail_id=i.inbound_detail_id AND li.deleted=0),0)
@@ -37,8 +43,8 @@ import com.baiyue.firstleg.dto.SmartLoadingDtos.Candidate; import org.apache.iba
                    WHERE o.inbound_role='MASTER'
                      AND split_item.tenant_id=o.tenant_id
                      AND split_item.parent_inbound_id=o.id
-                     AND split_item.source_measurement_item_id=i.id),0)
-   ORDER BY o.inbounded_at ASC, o.id ASC, i.id ASC
+                     AND split_item.source_inbound_detail_id=i.inbound_detail_id),0)
+   ORDER BY o.inbounded_at ASC, o.id ASC, i.inbound_detail_id ASC
   """)
  List<Candidate> candidates(@Param("warehouseId") long warehouseId);
 
@@ -56,7 +62,7 @@ import com.baiyue.firstleg.dto.SmartLoadingDtos.Candidate; import org.apache.iba
                        WHERE o.inbound_role='MASTER'
                          AND split_item.tenant_id=o.tenant_id
                          AND split_item.parent_inbound_id=o.id
-           AND split_item.source_measurement_item_id=i.id),0) availablePackageCount,
+           AND split_item.source_inbound_detail_id=i.inbound_detail_id),0) availablePackageCount,
          COALESCE(o.actual_gross_weight_kg / NULLIF(o.total_package_count, 0), 0) unitGrossWeightKg,
          COALESCE(o.actual_net_weight_kg / NULLIF(o.total_package_count, 0), 0) unitNetWeightKg,
          COALESCE(i.unit_volume_cbm,0) unitVolumeCbm
@@ -65,7 +71,14 @@ import com.baiyue.firstleg.dto.SmartLoadingDtos.Candidate; import org.apache.iba
       AND m.status='APPROVED'
       AND m.id=(SELECT MAX(m2.id) FROM fl_inbound_measurement m2
                  WHERE m2.tenant_id=o.tenant_id AND m2.inbound_id=o.id AND m2.status='APPROVED')
-    JOIN fl_inbound_measurement_item i ON i.tenant_id=o.tenant_id AND i.measurement_id=m.id
+    JOIN (
+      SELECT tenant_id,measurement_id,inbound_detail_id,SUM(package_count) package_count,
+             COALESCE(SUM(COALESCE(total_volume_cbm,COALESCE(unit_volume_cbm,0)*package_count))
+               / NULLIF(SUM(package_count),0),0) unit_volume_cbm
+        FROM fl_inbound_measurement_item
+       WHERE inbound_detail_id IS NOT NULL AND package_count>0
+       GROUP BY tenant_id,measurement_id,inbound_detail_id
+    ) i ON i.tenant_id=o.tenant_id AND i.measurement_id=m.id
    WHERE o.warehouse_id=#{warehouseId} AND o.id=#{inboundId} AND o.process_status='WAIT_SPLIT'
      AND o.actual_gross_weight_kg IS NOT NULL AND o.actual_net_weight_kg IS NOT NULL
      AND (o.inbound_role='MASTER' OR (o.split_purpose='REMAINDER' AND o.split_status='NOT_SPLIT'))
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingCandidateMapperContractTest.java b/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingCandidateMapperContractTest.java
index b74c68455..fbeb77491 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingCandidateMapperContractTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingCandidateMapperContractTest.java
@@ -19,7 +19,9 @@ class SmartLoadingCandidateMapperContractTest {
             .contains("m.status='APPROVED'")
             .contains("SELECT MAX(m2.id)")
             .contains("m2.status='APPROVED'")
-            .contains("i.inbound_detail_id IS NOT NULL")
+            .contains("WHERE inbound_detail_id IS NOT NULL AND package_count>0")
+            .contains("SUM(package_count) package_count")
+            .contains("GROUP BY tenant_id,measurement_id,inbound_detail_id")
             .contains("o.warehouse_id=#{warehouseId}")
             .contains("o.process_status='WAIT_SPLIT'")
             .contains("unitGrossWeightKg")
@@ -29,7 +31,7 @@ class SmartLoadingCandidateMapperContractTest {
             .doesNotContain("i.unit_weight_kg")
             .contains("SELECT SUM(li.package_count)")
             .contains("li.deleted=0")
-            .contains("ORDER BY o.inbounded_at ASC, o.id ASC, i.id ASC");
+            .contains("ORDER BY o.inbounded_at ASC, o.id ASC, i.inbound_detail_id ASC");
     }
 
     @Test
@@ -48,6 +50,8 @@ class SmartLoadingCandidateMapperContractTest {
             .contains("unitNetWeightKg")
             .doesNotContain("i.unit_weight_kg")
             .contains("SELECT SUM(li.package_count)")
+            .contains("SUM(package_count) package_count")
+            .contains("GROUP BY tenant_id,measurement_id,inbound_detail_id")
             .contains("FOR UPDATE");
     }
 }
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingSqlContractTest.java b/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingSqlContractTest.java
index d784cf5f6..8f4302c98 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingSqlContractTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingSqlContractTest.java
@@ -76,6 +76,18 @@ class SmartLoadingSqlContractTest {
             .contains("version INT UNSIGNED NOT NULL DEFAULT 0 COMMENT '乐观锁版本号'");
     }
 
+    @Test
+    @DisplayName("同一入库明细的多条单箱测量记录只生成一个候选")
+    void shouldAggregateCartonMeasurementRowsByInboundDetail() throws Exception {
+        String mapper = Files.readString(Path.of(
+            "src/main/java/com/baiyue/firstleg/mapper/SmartLoadingCandidateMapper.java"), StandardCharsets.UTF_8);
+        assertThat(mapper)
+            .contains("SUM(package_count) package_count")
+            .contains("GROUP BY tenant_id,measurement_id,inbound_detail_id")
+            .contains("split_item.source_inbound_detail_id=i.inbound_detail_id")
+            .doesNotContain("split_item.source_measurement_item_id=i.id");
+    }
+
     @Test
     @DisplayName("仓库备注使用计划先行与明细单表CAS并允许已拣明细仅改备注")
     void shouldUpdateWarehouseRemarkWithoutMultiTableTriggerConflict() throws Exception {