diff --git a/packages/designer/src/builtin-simulator/host.ts b/packages/designer/src/builtin-simulator/host.ts
index b2a41b831..91ab1a17b 100644
--- a/packages/designer/src/builtin-simulator/host.ts
+++ b/packages/designer/src/builtin-simulator/host.ts
@@ -6,6 +6,7 @@ import {
   getPublicPath,
   focusTracker,
   engineConfig,
+  globalLocale,
   IReactionPublic,
   IReactionOptions,
   IReactionDisposer,
@@ -198,7 +199,7 @@ export class BuiltinSimulatorHost implements ISimulatorHost<BuiltinSimulatorProp
   }
 
   @computed get locale(): string {
-    return this.get('locale');
+    return this.get('locale') || globalLocale.getLocale();
   }
 
   @computed get deviceClassName(): string | undefined {
diff --git a/packages/react-simulator-renderer/src/renderer.ts b/packages/react-simulator-renderer/src/renderer.ts
index dbb24a5bb..44fec0009 100644
--- a/packages/react-simulator-renderer/src/renderer.ts
+++ b/packages/react-simulator-renderer/src/renderer.ts
@@ -461,6 +461,7 @@ export class SimulatorRendererContainer implements BuiltinSimulatorRenderer {
           locale: renderer.locale,
           messages: _schema.i18n || {},
           device: renderer.device,
+          locale: renderer.locale,
           appHelper: renderer.context,
           rendererName: 'LowCodeRenderer',
           thisRequiredInJSE: host.thisRequiredInJSE,
@@ -632,4 +633,4 @@ function getLowCodeComponentProps(props: any) {
   return newProps;
 }
 
-export default new SimulatorRendererContainer();
\ No newline at end of file
+export default new SimulatorRendererContainer();