diff --git a/BUILD.gn b/BUILD.gn
index 39dcd12045fa29a86b593903f370675d4885894a..96aa78f91ebb47c35cdbc1f09e4b4150742da6e3 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -83,6 +83,7 @@ ohos_copy("ets_component") {
     "api/@internal/component/ets/rating.d.ts",
     "api/@internal/component/ets/rect.d.ts",
     "api/@internal/component/ets/refresh.d.ts",
+    "api/@internal/component/ets/relative_container.d.ts",
     "api/@internal/component/ets/remote_window.d.ts",
     "api/@internal/component/ets/rich_text.d.ts",
     "api/@internal/component/ets/row.d.ts",
diff --git a/api/@internal/component/ets/common.d.ts b/api/@internal/component/ets/common.d.ts
index 23b05409b79f14a7a147b510e40d8cb51f47013e..d410c9d35a5e2e7a03c9743edc7914167f3059b2 100644
--- a/api/@internal/component/ets/common.d.ts
+++ b/api/@internal/component/ets/common.d.ts
@@ -1475,6 +1475,15 @@ declare class CommonMethod<T> {
     lg?: number | { span: number; offset: number };
   }): T;
 
+  alignRules(value: {
+    left?: { anchor: string, align: HorizontalAlign };
+    right?: { anchor: string, align: HorizontalAlign };
+    middle?: { anchor: string, align: HorizontalAlign };
+    top?: { anchor: string, align: VerticalAlign };
+    bottom?: { anchor: string, align: VerticalAlign };
+    center?: { anchor: string, align: VerticalAlign };
+   }): T;
+
   /**
    * Specifies the aspect ratio of the current component.
    * @since 7
@@ -1813,4 +1822,4 @@ declare class View {
    * @since 7
    */
   create(value: any): any;
-}
+}
\ No newline at end of file
diff --git a/api/@internal/component/ets/relative_container.d.ts b/api/@internal/component/ets/relative_container.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..3e44be95a6358b719e2b8678c664f69638cedcc9
--- /dev/null
+++ b/api/@internal/component/ets/relative_container.d.ts
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provides ports for relative containers.
+ * @since 8
+ */
+interface RelativeContainerInterface {
+}
+  
+/**
+* @since 8
+*/
+declare class RelativeContainerAttribute extends CommonMethod<RelativeContainerAttribute> {
+}
+
+declare const RelativeContainer : RelativeContainerInterface;
+declare const RelativeContainerInstance: RelativeContainerAttribute;