diff --git a/config/BUILDCONFIG.gn b/config/BUILDCONFIG.gn
index 62334bbe6c68439a0a0bf2aba9ee7fe1f1f88ec2..cdb605f5da3fd509104a1131458d57302a428502 100755
--- a/config/BUILDCONFIG.gn
+++ b/config/BUILDCONFIG.gn
@@ -927,6 +927,11 @@ if (is_lite_system) {
   }
 }
 
+# Provide gn global variable extension file
+if (defined(product_build_config.ext_gn_variable_path)) {
+  import("${product_build_config.ext_gn_variable_path}")
+}
+
 set_defaults("executable") {
   configs = default_executable_configs
 }
diff --git a/hb/util/preloader/preloader_process_data.py b/hb/util/preloader/preloader_process_data.py
index 04263d5321a04341bb3265437b2f25390f191aa7..f606b7892818d3a0bc0342c4d9aa471208d2f92e 100644
--- a/hb/util/preloader/preloader_process_data.py
+++ b/hb/util/preloader/preloader_process_data.py
@@ -259,6 +259,11 @@ class Product():
                     self._dirs.source_root_dir, config.get('ext_sign_hap_py_path'))
                 if os.path.exists(path):
                     build_vars['ext_sign_hap_py_path'] = path
+            if 'ext_gn_variable_path' in config:
+                ext_gn_variable_path = os.path.join(
+                    self._dirs.source_root_dir, config.get('ext_gn_variable_path'))
+                if os.path.exists(ext_gn_variable_path):
+                    build_vars['ext_gn_variable_path'] = ext_gn_variable_path
 
         build_vars.update(self._device_info)
         if build_vars['os_level'] == 'mini' or build_vars['os_level'] == 'small':