diff --git a/backend/community/admin.py b/backend/community/admin.py
index 1d6bfaa..1a6d3af 100644
--- a/backend/community/admin.py
+++ b/backend/community/admin.py
@@ -37,7 +37,7 @@ class ActivityAdmin(ModelAdmin):
     
     fieldsets = (
         ('基本信息', {
-            'fields': ('title', 'description', 'banner', 'is_active')
+            'fields': ('title', 'description', 'banner', 'banner_url', 'is_active')
         }),
         ('时间与地点', {
             'fields': ('start_time', 'end_time', 'location'),
@@ -52,6 +52,8 @@ class ActivityAdmin(ModelAdmin):
     def banner_display(self, obj):
         if obj.banner:
             return format_html('<img src="{}" height="50" style="border-radius: 4px;" />', obj.banner.url)
+        elif obj.banner_url:
+            return format_html('<img src="{}" height="50" style="border-radius: 4px;" />', obj.banner_url)
         return "暂无"
 
     @display(description="报名人数")
diff --git a/backend/community/migrations/0004_activity_banner_url_alter_activity_banner.py b/backend/community/migrations/0004_activity_banner_url_alter_activity_banner.py
new file mode 100644
index 0000000..0871a9d
--- /dev/null
+++ b/backend/community/migrations/0004_activity_banner_url_alter_activity_banner.py
@@ -0,0 +1,23 @@
+# Generated by Django 6.0.1 on 2026-02-11 07:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('community', '0003_alter_reply_content_alter_topic_content_topicmedia'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='activity',
+            name='banner_url',
+            field=models.URLField(blank=True, help_text='可直接填写图片链接，若同时上传图片，将优先显示上传的图片', null=True, verbose_name='活动Banner链接'),
+        ),
+        migrations.AlterField(
+            model_name='activity',
+            name='banner',
+            field=models.ImageField(blank=True, null=True, upload_to='activities/banners/', verbose_name='活动Banner图'),
+        ),
+    ]
diff --git a/backend/community/models.py b/backend/community/models.py
index c9c082d..1c756f4 100644
--- a/backend/community/models.py
+++ b/backend/community/models.py
@@ -7,7 +7,8 @@ class Activity(models.Model):
     """
     title = models.CharField(max_length=100, verbose_name="活动标题")
     description = models.TextField(verbose_name="活动详情")
-    banner = models.ImageField(upload_to='activities/banners/', verbose_name="活动Banner图")
+    banner = models.ImageField(upload_to='activities/banners/', verbose_name="活动Banner图", null=True, blank=True)
+    banner_url = models.URLField(verbose_name="活动Banner链接", null=True, blank=True, help_text="可直接填写图片链接，若同时上传图片，将优先显示上传的图片")
     start_time = models.DateTimeField(verbose_name="开始时间")
     end_time = models.DateTimeField(verbose_name="结束时间")
     location = models.CharField(max_length=100, verbose_name="活动地点")
@@ -15,6 +16,24 @@ class Activity(models.Model):
     is_active = models.BooleanField(default=True, verbose_name="是否启用")
     created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
 
+    def clean(self):
+        from django.core.exceptions import ValidationError
+        if not self.banner and not self.banner_url:
+            raise ValidationError("Banner图片和Banner链接必须至少填写一项")
+
+    def save(self, *args, **kwargs):
+        self.clean()
+        super().save(*args, **kwargs)
+
+    @property
+    def display_banner_url(self):
+        """
+        获取Banner显示的URL，优先使用上传的图片
+        """
+        if self.banner:
+            return self.banner.url
+        return self.banner_url
+
     def __str__(self):
         return self.title
 
diff --git a/backend/community/serializers.py b/backend/community/serializers.py
index 2c226f2..b3c6a0c 100644
--- a/backend/community/serializers.py
+++ b/backend/community/serializers.py
@@ -3,6 +3,8 @@ from .models import Activity, ActivitySignup, Topic, Reply, TopicMedia
 from shop.serializers import WeChatUserSerializer, ESP32ConfigSerializer, ServiceSerializer, VCCourseSerializer
 
 class ActivitySerializer(serializers.ModelSerializer):
+    display_banner_url = serializers.ReadOnlyField()
+    
     class Meta:
         model = Activity
         fields = '__all__'
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