diff --git a/app/locales/index.ts b/app/locales/index.ts
index a32d3207..79e314fa 100644
--- a/app/locales/index.ts
+++ b/app/locales/index.ts
@@ -65,7 +65,7 @@ export const ALL_LANG_OPTIONS: Record<Lang, string> = {
 };
 
 const LANG_KEY = "lang";
-const DEFAULT_LANG = "cn";
+const DEFAULT_LANG = "en";
 
 const fallbackLang = en;
 const targetLang = ALL_LANGS[getLang()] as LocaleType;
diff --git a/app/store/config.ts b/app/store/config.ts
index b6488479..ca230cc3 100644
--- a/app/store/config.ts
+++ b/app/store/config.ts
@@ -46,13 +46,13 @@ export const DEFAULT_CONFIG = {
 
   modelConfig: {
     model: "gpt-3.5-turbo" as ModelType,
-    temperature: 0.6,
+    temperature: 0.5,
     top_p: 1,
     max_tokens: 2000,
     presence_penalty: 0,
     frequency_penalty: 0,
     sendMemory: true,
-    historyMessageCount: 1,
+    historyMessageCount: 4,
     compressMessageLengthThreshold: 1000,
     enableInjectSystemPrompts: true,
     template: DEFAULT_INPUT_TEMPLATE,