diff --git a/DjangoBlog/utils.py b/DjangoBlog/utils.py
index 3946dd6..110b573 100644
--- a/DjangoBlog/utils.py
+++ b/DjangoBlog/utils.py
@@ -261,11 +261,11 @@ def save_user_avatar(url):
 
 def delete_sidebar_cache(username):
     from django.core.cache.utils import make_template_fragment_key
-    from blog.models import LINK_SHOW_TYPE
+    from blog.models import LinkShowType
     keys = (
         make_template_fragment_key(
             'sidebar', [
-                username + x[0]]) for x in LINK_SHOW_TYPE)
+                username + x[0]]) for x in LinkShowType.choices)
     for k in keys:
         logger.info('delete sidebar key:' + k)
         cache.delete(k)
diff --git a/blog/models.py b/blog/models.py
index 78deeae..6612599 100644
--- a/blog/models.py
+++ b/blog/models.py
@@ -14,13 +14,13 @@ from mdeditor.fields import MDTextField
 
 logger = logging.getLogger(__name__)
 
-LINK_SHOW_TYPE = (
-    ('i', '首页'),
-    ('l', '列表页'),
-    ('p', '文章页面'),
-    ('a', '全站'),
-    ('s', '友情链接页面'),
-)
+
+class LinkShowType(models.TextChoices):
+    I = ('i', '首页')
+    L = ('l', '列表页')
+    P = ('p', '文章页面')
+    A = ('a', '全站')
+    S = ('s', '友情链接页面')
 
 
 class BaseModel(models.Model):
@@ -258,8 +258,8 @@ class Links(models.Model):
     show_type = models.CharField(
         '显示类型',
         max_length=1,
-        choices=LINK_SHOW_TYPE,
-        default='i')
+        choices=LinkShowType.choices,
+        default=LinkShowType.I)
     created_time = models.DateTimeField('创建时间', default=now)
     last_mod_time = models.DateTimeField('修改时间', default=now)
 
diff --git a/blog/templatetags/blog_tags.py b/blog/templatetags/blog_tags.py
index dc8ee3a..b9b9852 100644
--- a/blog/templatetags/blog_tags.py
+++ b/blog/templatetags/blog_tags.py
@@ -20,7 +20,7 @@ from django.template.defaultfilters import stringfilter
 from django.utils.safestring import mark_safe
 import random
 from django.urls import reverse
-from blog.models import Article, Category, Tag, Links, SideBar
+from blog.models import Article, Category, Tag, Links, SideBar, LinkShowType
 from django.utils.encoding import force_text
 from django.shortcuts import get_object_or_404
 import hashlib
@@ -144,7 +144,7 @@ def load_sidebar(user, linktype):
         '-views')[:blogsetting.sidebar_article_count]
     dates = Article.objects.datetimes('created_time', 'month', order='DESC')
     links = Links.objects.filter(is_enable=True).filter(
-        Q(show_type=str(linktype)) | Q(show_type='a'))
+        Q(show_type=str(linktype)) | Q(show_type=LinkShowType.A))
     commment_list = Comment.objects.filter(is_enable=True).order_by(
         '-id')[:blogsetting.sidebar_comment_count]
     # 标签云 计算字体大小
diff --git a/blog/views.py b/blog/views.py
index 19f5275..750160d 100644
--- a/blog/views.py
+++ b/blog/views.py
@@ -12,7 +12,7 @@ from django.views.decorators.csrf import csrf_exempt
 from django.contrib.auth.decorators import login_required
 from DjangoBlog.utils import cache, get_md5, get_blog_setting
 from django.shortcuts import get_object_or_404
-from blog.models import Article, Category, Tag, Links
+from blog.models import Article, Category, Tag, Links, LinkShowType
 from comments.forms import CommentForm
 import logging
 
@@ -30,7 +30,7 @@ class ArticleListView(ListView):
     page_type = ''
     paginate_by = settings.PAGINATE_BY
     page_kwarg = 'page'
-    link_type = 'l'
+    link_type = LinkShowType.L
 
     def get_view_cache_key(self):
         return self.request.get['pages']
@@ -89,7 +89,7 @@ class IndexView(ArticleListView):
     首页
     '''
     # 友情链接类型
-    link_type = 'i'
+    link_type = LinkShowType.I
 
     def get_queryset_data(self):
         article_list = Article.objects.filter(type='a', status='p')