diff --git a/ability/ability_runtime/child_process/libchild_process.ndk.json b/ability/ability_runtime/child_process/libchild_process.ndk.json
index 60cf2b93d475ae34e9eea9c1b247b2e625e6643a..f4fa170602536e3b67727e0f5731d2ee5b9dd19f 100644
--- a/ability/ability_runtime/child_process/libchild_process.ndk.json
+++ b/ability/ability_runtime/child_process/libchild_process.ndk.json
@@ -42,5 +42,9 @@
   {
       "first_introduced": "20",
       "name": "OH_Ability_StartNativeChildProcessWithConfigs"
+  },
+  {
+      "first_introduced": "21",
+      "name": "OH_Ability_ChildProcessConfigs_SetIsolationUid"
   }
 ]
diff --git a/ability/ability_runtime/child_process/native_child_process.h b/ability/ability_runtime/child_process/native_child_process.h
index ce59adf740bd17bd4832cc76d0e6ef13fddae81c..ec4d5c561fad7dced2faca1c2f53fdf086ff5c07 100644
--- a/ability/ability_runtime/child_process/native_child_process.h
+++ b/ability/ability_runtime/child_process/native_child_process.h
@@ -165,7 +165,6 @@ Ability_NativeChildProcess_ErrCode OH_Ability_DestroyChildProcessConfigs(Ability
 
 /**
  * @brief Sets the isolation mode for the specified child process configs.
- * The isolationMode only takes effect in {@link OH_Ability_StartNativeChildProcessWithConfigs}.
  *
  * @param configs Pointer to the child process configs object. Must not be nullptr.
  * @param isolationMode The isolation mode to set. See {@link NativeChildProcess_IsolationMode} for details.
@@ -176,6 +175,22 @@ Ability_NativeChildProcess_ErrCode OH_Ability_DestroyChildProcessConfigs(Ability
 Ability_NativeChildProcess_ErrCode OH_Ability_ChildProcessConfigs_SetIsolationMode(
     Ability_ChildProcessConfigs* configs, NativeChildProcess_IsolationMode isolationMode);
 
+/**
+ * @brief Sets the UID isolation flag for the specified child process configs.
+ * The isolationUid only takes effect when {@link OH_Ability_ChildProcessConfigs_SetIsolationMode}
+ * is set to {@link NCP_ISOLATION_MODE_ISOLATED}.
+ *
+ * @param configs Pointer to the child process configs object. Must not be nullptr.
+ * @param isolationUid The UID isolation setting to apply.
+ *        - true: uses independent UID
+ *        - false: uses parent process's UID
+ * @return Returns {@link NCP_NO_ERROR} if the UID isolation flag is set successfully.
+ *         Returns {@link NCP_ERR_INVALID_PARAM} if the input parameters are invalid.
+ * @since 21
+ */
+Ability_NativeChildProcess_ErrCode OH_Ability_ChildProcessConfigs_SetIsolationUid(
+    Ability_ChildProcessConfigs* configs, bool isolationUid);
+
 /**
  * @brief Sets the process name for the specified child process configs.
  *