diff --git a/src/channel.ts b/src/channel.ts
index 42a9036..819cc3a 100644
--- a/src/channel.ts
+++ b/src/channel.ts
@@ -83,7 +83,7 @@ export const qqbotPlugin: ChannelPlugin<ResolvedQQBotAccount> = {
         clientSecret,
         clientSecretFile: input.tokenFile,
         name: input.name,
-        imageServerBaseUrl: input.imageServerBaseUrl,
+        imageServerPublicIp: input.imageServerPublicIp,
       });
     },
   },
diff --git a/src/config.ts b/src/config.ts
index dadcdf2..2b65118 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -63,7 +63,7 @@ export function resolveQQBotAccount(
       dmPolicy: qqbot?.dmPolicy,
       allowFrom: qqbot?.allowFrom,
       systemPrompt: qqbot?.systemPrompt,
-      imageServerBaseUrl: qqbot?.imageServerBaseUrl,
+      imageServerPublicIp: qqbot?.imageServerPublicIp,
     };
     appId = qqbot?.appId ?? "";
   } else {
@@ -98,7 +98,7 @@ export function resolveQQBotAccount(
     clientSecret,
     secretSource,
     systemPrompt: accountConfig.systemPrompt,
-    imageServerBaseUrl: accountConfig.imageServerBaseUrl || process.env.QQBOT_IMAGE_SERVER_BASE_URL,
+    imageServerPublicIp: accountConfig.imageServerPublicIp || process.env.QQBOT_IMAGE_SERVER_PUBLIC_IP,
     config: accountConfig,
   };
 }
@@ -109,7 +109,7 @@ export function resolveQQBotAccount(
 export function applyQQBotAccountConfig(
   cfg: MoltbotConfig,
   accountId: string,
-  input: { appId?: string; clientSecret?: string; clientSecretFile?: string; name?: string; imageServerBaseUrl?: string }
+  input: { appId?: string; clientSecret?: string; clientSecretFile?: string; name?: string; imageServerPublicIp?: string }
 ): MoltbotConfig {
   const next = { ...cfg };
 
@@ -126,7 +126,7 @@ export function applyQQBotAccountConfig(
             ? { clientSecretFile: input.clientSecretFile }
             : {}),
         ...(input.name ? { name: input.name } : {}),
-        ...(input.imageServerBaseUrl ? { imageServerBaseUrl: input.imageServerBaseUrl } : {}),
+        ...(input.imageServerPublicIp ? { imageServerPublicIp: input.imageServerPublicIp } : {}),
       },
     };
   } else {
@@ -147,7 +147,7 @@ export function applyQQBotAccountConfig(
                 ? { clientSecretFile: input.clientSecretFile }
                 : {}),
             ...(input.name ? { name: input.name } : {}),
-            ...(input.imageServerBaseUrl ? { imageServerBaseUrl: input.imageServerBaseUrl } : {}),
+            ...(input.imageServerPublicIp ? { imageServerPublicIp: input.imageServerPublicIp } : {}),
           },
         },
       },
diff --git a/src/gateway.ts b/src/gateway.ts
index fff94fc..98b84ac 100644
--- a/src/gateway.ts
+++ b/src/gateway.ts
@@ -98,15 +98,16 @@ export async function startGateway(ctx: GatewayContext): Promise<void> {
     throw new Error("QQBot not configured (missing appId or clientSecret)");
   }
 
-  // 如果配置了公网 URL，启动图床服务器
+  // 如果配置了公网 IP，启动图床服务器
   let imageServerBaseUrl: string | null = null;
-  if (account.imageServerBaseUrl) {
-    // 使用用户配置的公网地址作为 baseUrl
-    await ensureImageServer(log, account.imageServerBaseUrl);
-    imageServerBaseUrl = account.imageServerBaseUrl;
+  if (account.imageServerPublicIp) {
+    // 内部组装完整 URL
+    const publicBaseUrl = `http://${account.imageServerPublicIp}:${IMAGE_SERVER_PORT}`;
+    await ensureImageServer(log, publicBaseUrl);
+    imageServerBaseUrl = publicBaseUrl;
     log?.info(`[qqbot:${account.accountId}] Image server enabled with URL: ${imageServerBaseUrl}`);
   } else {
-    log?.info(`[qqbot:${account.accountId}] Image server disabled (no imageServerBaseUrl configured)`);
+    log?.info(`[qqbot:${account.accountId}] Image server disabled (no imageServerPublicIp configured)`);
   }
 
   let reconnectAttempts = 0;
diff --git a/src/onboarding.ts b/src/onboarding.ts
index 6310ba1..401c074 100644
--- a/src/onboarding.ts
+++ b/src/onboarding.ts
@@ -29,14 +29,14 @@ interface QQBotChannelConfig {
   clientSecret?: string;
   clientSecretFile?: string;
   name?: string;
-  imageServerBaseUrl?: string;
+  imageServerPublicIp?: string;
   accounts?: Record<string, {
     enabled?: boolean;
     appId?: string;
     clientSecret?: string;
     clientSecretFile?: string;
     name?: string;
-    imageServerBaseUrl?: string;
+    imageServerPublicIp?: string;
   }>;
 }
 
diff --git a/src/types.ts b/src/types.ts
index e185263..00e8a42 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -19,8 +19,8 @@ export interface ResolvedQQBotAccount {
   secretSource: "config" | "file" | "env" | "none";
   /** 系统提示词 */
   systemPrompt?: string;
-  /** 图床服务器公网地址 */
-  imageServerBaseUrl?: string;
+  /** 图床服务器公网 IP（内部自动组装成 http://IP:18765） */
+  imageServerPublicIp?: string;
   config: QQBotAccountConfig;
 }
 
@@ -37,8 +37,8 @@ export interface QQBotAccountConfig {
   allowFrom?: string[];
   /** 系统提示词，会添加在用户消息前面 */
   systemPrompt?: string;
-  /** 图床服务器公网地址，用于发送图片，例如 http://your-ip:18765 */
-  imageServerBaseUrl?: string;
+  /** 图床服务器公网 IP，用于发送图片，例如 1.2.3.4（内部自动组装成 http://IP:18765） */
+  imageServerPublicIp?: string;
 }
 
 /**