diff --git a/api/@ohos.application.AbilityLifecycleCallback.d.ts b/api/@ohos.application.AbilityLifecycleCallback.d.ts
index 13ec3ef6bbb44a9788bafff2b82417468ad05822..77e747eb78d62338fe0fd3fe9a778b2edc55914d 100644
--- a/api/@ohos.application.AbilityLifecycleCallback.d.ts
+++ b/api/@ohos.application.AbilityLifecycleCallback.d.ts
@@ -24,7 +24,7 @@ import Ability from "./@ohos.application.Ability";
  */
 export default class AbilityLifecycleCallback {
     /**
-     * Called back when the ability is started for initialization.
+     * Called back when an ability is started for initialization.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
@@ -34,7 +34,7 @@ export default class AbilityLifecycleCallback {
     onAbilityCreate(ability: Ability): void;
 
     /**
-     * Called back when the ability window stage is created.
+     * Called back when an ability window stage is created.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
@@ -44,7 +44,7 @@ export default class AbilityLifecycleCallback {
     onAbilityWindowStageCreate(ability: Ability): void;
  
     /**
-     * Called back when the ability window stage is created.
+     * Called back when an ability window stage is destroyed.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
@@ -54,7 +54,7 @@ export default class AbilityLifecycleCallback {
     onAbilityWindowStageDestroy(ability: Ability): void;
  
     /**
-     * Called back when the ability window stage is created.
+     * Called back when an ability is destroyed.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
@@ -64,7 +64,7 @@ export default class AbilityLifecycleCallback {
     onAbilityDestroy(ability: Ability): void;
  
     /**
-     * Called back when the ability window stage is created.
+     * Called back when the state of an ability changes to foreground.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
@@ -74,7 +74,7 @@ export default class AbilityLifecycleCallback {
     onAbilityForeground(ability: Ability): void;
  
     /**
-     * Called back when the ability window stage is created.
+     * Called back when the state of an ability changes to background.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
@@ -84,7 +84,7 @@ export default class AbilityLifecycleCallback {
     onAbilityBackground(ability: Ability): void;
  
     /**
-     * Called back when the ability window stage is created.
+     * Called back when an ability prepares to continue.
      *
      * @since 9
      * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
diff --git a/api/@ohos.application.EnvironmentCallback.d.ts b/api/@ohos.application.EnvironmentCallback.d.ts
new file mode 100755
index 0000000000000000000000000000000000000000..b19bd5792eff52fc21ea06e0d6501cf543ba9f7c
--- /dev/null
+++ b/api/@ohos.application.EnvironmentCallback.d.ts
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+import { Configuration } from './@ohos.application.Configuration';
+
+/**
+ * The environment callback.
+ *
+ * @since 9
+ * @syscap SystemCapability.Ability.AbilityRuntime.Core
+ * @permission N/A
+ */
+export default class EnvironmentCallback {
+    /**
+     * Called when the system configuration is updated.
+     *
+     * @since 9
+     * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
+     * @param config: Indicates the updated configuration.
+     * @StageModelOnly
+     */
+     onConfigurationUpdated(config: Configuration): void;
+}
diff --git a/api/application/ApplicationContext.d.ts b/api/application/ApplicationContext.d.ts
index eb6b30bf9afdacda5a528d96c29cd4d52595eed5..2f605c61cf00e4bfa78422ab766a12527bcc5db8 100755
--- a/api/application/ApplicationContext.d.ts
+++ b/api/application/ApplicationContext.d.ts
@@ -16,6 +16,7 @@
 import { AsyncCallback } from "../basic";
 import Context from "./Context";
 import AbilityLifecycleCallback from "../@ohos.application.AbilityLifecycleCallback";
+import EnvironmentCallback from "../@ohos.application.EnvironmentCallback";
 
 /**
  * The context of an application. It allows access to application-specific resources.
@@ -48,4 +49,27 @@ export default class ApplicationContext extends Context {
      */
     unregisterAbilityLifecycleCallback(callbackId: number,  callback: AsyncCallback<void>): void;
     unregisterAbilityLifecycleCallback(callbackId: number): Promise<void>;
+
+    /**
+     * Register environment callback.
+     *
+     * @since 9
+     * @syscap SystemCapability.Ability.AbilityRuntime.Core
+     * @param callback The environment callback.
+     * @return Returns the number code of the callback.
+     * @StageModelOnly
+     */
+    registerEnvironmentCallback(callback: EnvironmentCallback): number;
+
+    /**
+     * Unregister environment callback.
+     *
+     * @since 9
+     * @syscap SystemCapability.Ability.AbilityRuntime.Core
+     * @param callbackId Indicates the number code of the callback.
+     * @return -
+     * @StageModelOnly
+     */
+    unregisterEnvironmentCallback(callbackId: number,  callback: AsyncCallback<void>): void;
+    unregisterEnvironmentCallback(callbackId: number): Promise<void>;
 }