diff --git a/api/@internal/component/ets/flow_item.d.ts b/api/@internal/component/ets/flow_item.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..801acb1a9bcedfed26879927890ceb9837bbcb73
--- /dev/null
+++ b/api/@internal/component/ets/flow_item.d.ts
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022 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.
+ */
+
+/**
+ * Mesh container for static fixed-size layout scenarios.
+ * @since 9
+ */
+interface FlowItemInterface {
+  /**
+   * Construct the flow item.
+   * @since 9
+   */
+  (): FlowItemAttribute;
+}
+
+/**
+ * @since 9
+ */
+declare class FlowItemAttribute extends CommonMethod<FlowItemAttribute> {}
+
+declare const FlowItem: FlowItemInterface
+declare const FlowItemInstance: FlowItemAttribute;
diff --git a/api/@internal/component/ets/index-full.d.ts b/api/@internal/component/ets/index-full.d.ts
index 85abad3e47bf7fc15895bc09c2cdb7140322d481..b5c05715dbd1472af47374378dc9d78cc8cbe702 100644
--- a/api/@internal/component/ets/index-full.d.ts
+++ b/api/@internal/component/ets/index-full.d.ts
@@ -106,3 +106,5 @@
 /// <reference path="./common_ts_ets_api.d.ts" />
 /// <reference path="./grid_row.d.ts" />
 /// <reference path="./grid_col.d.ts" />
+/// <reference path="./water_flow.d.ts" />
+/// <reference path="./flow_item.d.ts" />
diff --git a/api/@internal/component/ets/water_flow.d.ts b/api/@internal/component/ets/water_flow.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..c5387a22c519dbdf727348abd181932a23efa40b
--- /dev/null
+++ b/api/@internal/component/ets/water_flow.d.ts
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2022 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.
+ */
+
+/**
+* Defines the water flow options.
+* @since 9
+*/
+declare interface WaterFlowOptions {
+  /**
+   * Describes the water flow footer.
+   * @since 9
+   */
+  footer?: CustomBuilder;
+
+  /**
+   * Describes the water flow scroller.
+   * @since 9
+   */
+  scroller?: Scroller;
+}
+
+
+/**
+ * @since 9
+ */
+interface WaterFlowInterface {
+  /**
+   * WaterFlow is returned when the parameter is transferred. Only support api: scrollToIndex
+   * @since 9
+   */
+  (options?: WaterFlowOptions): WaterFlowAttribute;
+}
+
+/**
+ * @since 9
+ */
+declare class WaterFlowAttribute extends CommonMethod<WaterFlowAttribute> {
+  /**
+   * This parameter specifies the number of columns in the current waterflow.
+   * @since 9
+   */
+  columnsTemplate(value: string): WaterFlowAttribute;
+
+  /**
+   * This parameter specifies the min or max size of each item.
+   * @since 9
+   */
+  itemConstraintSize(value: ConstraintSizeOptions): WaterFlowAttribute;
+
+  /**
+   * Set the number of rows in the current waterflow.
+   * @since 9
+   */
+  rowsTemplate(value: string): WaterFlowAttribute;
+
+  /**
+   * Set the spacing between columns.
+   * @since 9
+   */
+  columnsGap(value: Length): WaterFlowAttribute;
+
+  /**
+   * Set the spacing between rows.
+   * @since 9
+   */
+  rowsGap(value: Length): WaterFlowAttribute;
+
+  /**
+   * Control layout direction of the WaterFlow.
+   * @since 9
+   */
+  layoutDirection(value: FlexDirection): WaterFlowAttribute;
+  
+  /**
+   * Called when the water flow begins to arrive.
+   * @since 9
+   */
+  onReachStart(event: () => void): WaterFlowAttribute;
+
+  /**
+   * Called when the water flow reaches the end.
+   * @since 9
+   */
+  onReachEnd(event: () => void): WaterFlowAttribute;
+}
+
+declare const WaterFlow: WaterFlowInterface;
+declare const WaterFlowInstance: WaterFlowAttribute;