diff --git a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/facade/package-info.java b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/facade/package-info.java
new file mode 100644
index 0000000..b42d911
--- /dev/null
+++ b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/facade/package-info.java
@@ -0,0 +1,7 @@
+/**
+ * DDD Domain层和Infrastructure的粘合剂：通过倒置依赖.
+ *
+ * <p>domain层声明需要基础设施层实现的接口：RPC, DB, Cache, MQ等.</p>
+ * <p>为了方便产品人员查看领域层代码，梳理业务，统一放在facade package，减少对产品同学的干扰.</p>
+ */
+package org.example.cp.oms.domain.facade;
\ No newline at end of file
diff --git a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/OrderMain.java b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/OrderMain.java
index 4dd90e7..41052e0 100644
--- a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/OrderMain.java
+++ b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/OrderMain.java
@@ -4,6 +4,7 @@
 import lombok.Setter;
 import lombok.extern.slf4j.Slf4j;
 import io.github.dddplus.api.RequestProfile;
+import org.example.cp.oms.domain.model.vo.OrderItemDelegate;
 import org.example.cp.oms.spec.exception.OrderException;
 import org.example.cp.oms.domain.model.vo.ProductDelegate;
 import org.example.cp.oms.spec.model.IOrderMain;
@@ -36,6 +37,7 @@ public class OrderMain implements IOrderMain {
     private String step;
 
     private ProductDelegate productDelegate;
+    private OrderItemDelegate orderItemDelegate;
 
     @Getter
     private String x1, x2;
@@ -52,6 +54,7 @@ private OrderMain(OrderModelCreator creator) {
         this.requestProfile = creator.getRequestProfile();
 
         this.productDelegate = ProductDelegate.createWith(creator);
+        this.orderItemDelegate = OrderItemDelegate.createWith(creator);
     }
 
     private OrderMain validate() throws OrderException {
diff --git a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItem.java b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItem.java
index f1270a4..bd9b5dd 100644
--- a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItem.java
+++ b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItem.java
@@ -2,5 +2,16 @@
 
 import org.example.cp.oms.spec.model.vo.IOrderItem;
 
+import java.math.BigDecimal;
+
+/**
+ * 订单项.
+ *
+ * <p>每个{@link org.example.cp.oms.domain.model.OrderMain}包含多个订单项.</p>
+ */
 public class OrderItem implements IOrderItem {
+    private String sku;
+    private Integer quantity;
+    private String orderLine;
+    private BigDecimal price;
 }
diff --git a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItemDelegate.java b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItemDelegate.java
new file mode 100644
index 0000000..919dde0
--- /dev/null
+++ b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/OrderItemDelegate.java
@@ -0,0 +1,29 @@
+package org.example.cp.oms.domain.model.vo;
+
+import org.example.cp.oms.domain.model.OrderModelCreator;
+import org.example.cp.oms.spec.model.vo.IOrderItem;
+import org.example.cp.oms.spec.model.vo.IOrderItemDelegate;
+import org.example.cp.oms.spec.model.vo.IProduct;
+import org.example.cp.oms.spec.model.vo.IProductDelegate;
+
+import javax.validation.constraints.NotNull;
+import java.util.ArrayList;
+import java.util.List;
+
+public class OrderItemDelegate implements IOrderItemDelegate {
+
+    private List<OrderItem> items;
+
+    private OrderItemDelegate() {}
+
+    public static OrderItemDelegate createWith(@NotNull OrderModelCreator creator) {
+        OrderItemDelegate delegate = new OrderItemDelegate();
+        delegate.items = new ArrayList<>();
+        return delegate;
+    }
+
+    @Override
+    public List<? extends IOrderItem> getItems() {
+        return items;
+    }
+}
diff --git a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/Product.java b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/Product.java
index cf2158d..18f5c9f 100644
--- a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/Product.java
+++ b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/Product.java
@@ -5,6 +5,10 @@
 public class Product implements IProduct {
     private String code;
 
+    void setCode(String code) {
+        this.code = code;
+    }
+
     @Override
     public String code() {
         return code;
diff --git a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/ProductDelegate.java b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/ProductDelegate.java
index fb5d500..90702a1 100644
--- a/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/ProductDelegate.java
+++ b/order-center-cp/cp-oc-domain/src/main/java/org/example/cp/oms/domain/model/vo/ProductDelegate.java
@@ -20,7 +20,6 @@ public static ProductDelegate createWith(@NotNull OrderModelCreator creator) {
         return delegate;
     }
 
-
     @Override
     public List<? extends IProduct> getProducts() {
         return products;
diff --git a/order-center-cp/cp-oc-spec/src/main/java/org/example/cp/oms/spec/model/vo/IOrderItemDelegate.java b/order-center-cp/cp-oc-spec/src/main/java/org/example/cp/oms/spec/model/vo/IOrderItemDelegate.java
new file mode 100644
index 0000000..8c79a09
--- /dev/null
+++ b/order-center-cp/cp-oc-spec/src/main/java/org/example/cp/oms/spec/model/vo/IOrderItemDelegate.java
@@ -0,0 +1,7 @@
+package org.example.cp.oms.spec.model.vo;
+
+import java.util.List;
+
+public interface IOrderItemDelegate {
+    List<? extends IOrderItem> getItems();
+}