diff --git a/src/main/java/com/example/building/dto/CreateOrderRequest.java b/src/main/java/com/example/building/dto/CreateOrderRequest.java
index 4db6a29..34b450b 100644
--- a/src/main/java/com/example/building/dto/CreateOrderRequest.java
+++ b/src/main/java/com/example/building/dto/CreateOrderRequest.java
@@ -70,5 +70,20 @@ public class CreateOrderRequest {
          * 销售单价(用户可自定义)
          */
         private BigDecimal price;
+
+        /**
+         * 长度(cm)
+         */
+        private BigDecimal length;
+
+        /**
+         * 宽度(cm)
+         */
+        private BigDecimal width;
+
+        /**
+         * 面积(m²)
+         */
+        private BigDecimal area;
     }
 }
diff --git a/src/main/java/com/example/building/entity/OrderItem.java b/src/main/java/com/example/building/entity/OrderItem.java
index fd8214a..3cafa71 100644
--- a/src/main/java/com/example/building/entity/OrderItem.java
+++ b/src/main/java/com/example/building/entity/OrderItem.java
@@ -86,6 +86,21 @@ public class OrderItem {
      */
     private BigDecimal subtotal;
 
+    /**
+     * 长度(cm)
+     */
+    private BigDecimal length;
+
+    /**
+     * 宽度(cm)
+     */
+    private BigDecimal width;
+
+    /**
+     * 面积(m²)
+     */
+    private BigDecimal area;
+
     @TableField(fill = FieldFill.INSERT)
     private LocalDateTime createdAt;
 }
diff --git a/src/main/java/com/example/building/service/impl/OrderServiceImpl.java b/src/main/java/com/example/building/service/impl/OrderServiceImpl.java
index 3508fd1..9ef0bce 100644
--- a/src/main/java/com/example/building/service/impl/OrderServiceImpl.java
+++ b/src/main/java/com/example/building/service/impl/OrderServiceImpl.java
@@ -113,6 +113,9 @@ public class OrderServiceImpl implements OrderService {
             item.setDescription(product.getDescription());
             item.setPrice(price);
             item.setQuantity(itemDTO.getQuantity());
+            item.setLength(itemDTO.getLength());
+            item.setWidth(itemDTO.getWidth());
+            item.setArea(itemDTO.getArea());
             item.setSubtotal(subtotal);
             orderItems.add(item);
 
@@ -364,6 +367,9 @@ public class OrderServiceImpl implements OrderService {
             item.setDescription(product.getDescription());
             item.setPrice(price);
             item.setQuantity(itemDTO.getQuantity());
+            item.setLength(itemDTO.getLength());
+            item.setWidth(itemDTO.getWidth());
+            item.setArea(itemDTO.getArea());
             item.setSubtotal(subtotal);
             orderItems.add(item);
             orderItemMapper.insert(item);
diff --git a/src/main/resources/db/migration/V13__add_order_item_size_fields.sql b/src/main/resources/db/migration/V13__add_order_item_size_fields.sql
new file mode 100644
index 0000000..1f7b97b
--- /dev/null
+++ b/src/main/resources/db/migration/V13__add_order_item_size_fields.sql
@@ -0,0 +1,4 @@
+-- 添加商品长度、宽度、面积字段
+ALTER TABLE order_items ADD COLUMN length DECIMAL(10,2) COMMENT '长度(cm)';
+ALTER TABLE order_items ADD COLUMN width DECIMAL(10,2) COMMENT '宽度(cm)';
+ALTER TABLE order_items ADD COLUMN area DECIMAL(10,4) COMMENT '面积(m²)';
\ No newline at end of file