diff --git a/.env.example b/.env.example
index a69ae47f0..b98ff44cd 100644
--- a/.env.example
+++ b/.env.example
@@ -12,3 +12,5 @@ PUBLIC_SECRET_KEY=
 SITE_PASSWORD=
 # ID of the model to use. https://platform.openai.com/docs/api-reference/models/list
 OPENAI_API_MODEL=
+# Set the maximum number of historical messages used for contextual contact
+PUBLIC_MAX_HISTORY_MESSAGES=
diff --git a/src/components/Generator.tsx b/src/components/Generator.tsx
index a0437af1f..936473caa 100644
--- a/src/components/Generator.tsx
+++ b/src/components/Generator.tsx
@@ -19,6 +19,7 @@ export default () => {
   const [isStick, setStick] = createSignal(false)
   const [temperature, setTemperature] = createSignal(0.6);
   const temperatureSetting = (value: number) => { setTemperature(value) }
+  const maxHistoryMessages = parseInt(import.meta.env.PUBLIC_MAX_HISTORY_MESSAGES || '9')
 
   createEffect(() => (isStick() && smoothToBottom()))
 
@@ -89,7 +90,7 @@ export default () => {
     try {
       const controller = new AbortController()
       setController(controller)
-      const requestMessageList = [...messageList()]
+      const requestMessageList = messageList().slice(-maxHistoryMessages)
       if (currentSystemRoleSettings()) {
         requestMessageList.unshift({
           role: 'system',
diff --git a/src/env.d.ts b/src/env.d.ts
index 4d60ac788..c6cf12c55 100644
--- a/src/env.d.ts
+++ b/src/env.d.ts
@@ -8,6 +8,7 @@ interface ImportMetaEnv {
   readonly PUBLIC_SECRET_KEY: string
   readonly SITE_PASSWORD: string
   readonly OPENAI_API_MODEL: string
+  readonly PUBLIC_MAX_HISTORY_MESSAGES: string;
 }
 
 interface ImportMeta {