diff --git a/src/views/modules/ecss/components/PackingDetailTab.vue b/src/views/modules/ecss/components/PackingDetailTab.vue
index cba24bf..b93fbc5 100644
--- a/src/views/modules/ecss/components/PackingDetailTab.vue
+++ b/src/views/modules/ecss/components/PackingDetailTab.vue
@@ -112,17 +112,17 @@
         <el-row :gutter="20">
           <el-col :span="24">
             <el-form-item label="箱数" prop="box_qty">
-              <el-input v-model="editBoxForm.box_qty" :min="1" :precision="0" style="width: 100%"></el-input>
+              <el-input v-model="editBoxForm.box_qty" @input="onBoxQtyChange" :min="1" :precision="0" style="width: 100%"></el-input>
             </el-form-item>
           </el-col>
           <el-col :span="24">
             <el-form-item label="毛重" prop="grossWeight">
-              <el-input v-model="editBoxForm.grossWeight" :min="0" :precision="2" style="width: 100%"></el-input>
+              <el-input v-model="editBoxForm.grossWeight" @input="onGrossWeightChange" :min="0" :precision="2" style="width: 100%"></el-input>
             </el-form-item>
           </el-col>
           <el-col :span="24">
             <el-form-item label="净重" prop="netWeight">
-              <el-input v-model="editBoxForm.netWeight" :min="0" :precision="2" style="width: 100%"></el-input>
+              <el-input v-model="editBoxForm.netWeight" @input="onNetWeightChange" :min="0" :precision="2" style="width: 100%"></el-input>
             </el-form-item>
           </el-col>
         </el-row>
@@ -611,6 +611,85 @@ export default {
       this.editDetailDialogVisible = true;
     },
 
+    /**
+     * 箱数改变时自动计算净重
+     * 保持毛重不变，重新计算净重
+     * 计算公式：净重 = 毛重 - box_qty/2
+     */
+    onBoxQtyChange(value) {
+      // 防止循环触发，使用标志位
+      if (this._isCalculating) {
+        return;
+      }
+
+      this._isCalculating = true;
+
+      try {
+        const boxQty = parseFloat(value) || 0;
+        const grossWeight = parseFloat(this.editBoxForm.grossWeight) || 0;
+
+        // 计算净重：净重 = 毛重 - box_qty/2
+        const netWeight = grossWeight - (boxQty / 2);
+
+        // 保留2位小数
+        this.editBoxForm.netWeight = netWeight.toFixed(2);
+      } finally {
+        this._isCalculating = false;
+      }
+    },
+
+    /**
+     * 毛重改变时自动计算净重
+     * 计算公式：净重 = 毛重 - box_qty/2
+     */
+    onGrossWeightChange(value) {
+      // 防止循环触发，使用标志位
+      if (this._isCalculating) {
+        return;
+      }
+
+      this._isCalculating = true;
+
+      try {
+        const grossWeight = parseFloat(value) || 0;
+        const boxQty = parseFloat(this.editBoxForm.box_qty) || 0;
+
+        // 计算净重：净重 = 毛重 - box_qty/2
+        const netWeight = grossWeight - (boxQty / 2);
+
+        // 保留2位小数
+        this.editBoxForm.netWeight = netWeight.toFixed(2);
+      } finally {
+        this._isCalculating = false;
+      }
+    },
+
+    /**
+     * 净重改变时自动计算毛重
+     * 反向计算公式：毛重 = 净重 + box_qty/2
+     */
+    onNetWeightChange(value) {
+      // 防止循环触发，使用标志位
+      if (this._isCalculating) {
+        return;
+      }
+
+      this._isCalculating = true;
+
+      try {
+        const netWeight = parseFloat(value) || 0;
+        const boxQty = parseFloat(this.editBoxForm.box_qty) || 0;
+
+        // 反向计算毛重：毛重 = 净重 + box_qty/2
+        const grossWeight = netWeight + (boxQty / 2);
+
+        // 保留2位小数
+        this.editBoxForm.grossWeight = grossWeight.toFixed(2);
+      } finally {
+        this._isCalculating = false;
+      }
+    },
+
     // 提交修改箱信息
     submitEditBox() {
       this.$refs.editBoxForm.validate(valid => {