diff --git a/njupt_api/baselib/config.py b/njupt_api/baselib/config.py
index 7e6a62e..dbed5e8 100644
--- a/njupt_api/baselib/config.py
+++ b/njupt_api/baselib/config.py
@@ -60,11 +60,12 @@ class Config:
         doc_system["host"] = "0.0.0.0"
         doc_system["port"] = 8000
         doc_system["reload"] = True
+        doc_system["public_host"] = "http://127.0.0.1:8000"
 
         doc_schedule["playwright_headless"] = True
         doc_schedule["jwxt_login_method"] = "sso"
         doc_schedule["semester_start_date"] = "2026-03-02"
-        doc_schedule["schedule_title_template"] = "芒果酸的第 {title} 周课程表"
+        doc_schedule["schedule_title_template"] = "芒果酸的第 {week} 周课程表"
         doc_schedule["schedule_subtitle_template"] = "我也要上吗？"
 
         doc_log["log_api_request_details"] = False
diff --git a/router/enhance/lib.py b/router/enhance/lib.py
index e0c510c..da94d41 100644
--- a/router/enhance/lib.py
+++ b/router/enhance/lib.py
@@ -70,7 +70,7 @@ async def apply_enhance(course_list: list[dict], week: int, img: bool) -> Return
 
     img_url = None
     if img:
-        img_url = f"http://172.28.143.24:8000/api/schedule/img/{
+        img_url = f"{config.get('system', 'public_host', 'http://127.0.0.1:8000')}/api/schedule/img/{
             await generate_img(final_course_list, title_template.format(**vars_), subtitle_template.format(**vars_))
         }"
 
diff --git a/webui/src/pages/Config.vue b/webui/src/pages/Config.vue
index 82629fd..4499334 100644
--- a/webui/src/pages/Config.vue
+++ b/webui/src/pages/Config.vue
@@ -67,6 +67,12 @@ function varTag(code: string, description: string) {
             show-switch
             title="热重载 Python 代码文件"
           />
+          <setting-card
+            v-model:string-value="CONFIG.data.system.public_host"
+            message="Suan API 需要对外提供资源（例如课表图片）时，使用此主机名"
+            show-input
+            title="外部域名 / 主机名"
+          />
         </n-flex>
       </n-collapse-item>
       <n-collapse-item name="schedule" title="课表设置">
diff --git a/webui/src/types/config.ts b/webui/src/types/config.ts
index 135880c..755caca 100644
--- a/webui/src/types/config.ts
+++ b/webui/src/types/config.ts
@@ -2,6 +2,7 @@ export interface ConfigSystemDto {
   host?: string
   port?: number
   reload?: boolean
+  public_host?: string
 }
 
 export interface ConfigScheduleDto {