diff --git a/EduSystemServer/EduSystemServer/settings.py b/EduSystemServer/EduSystemServer/settings.py
index ad807ba..34c413d 100644
--- a/EduSystemServer/EduSystemServer/settings.py
+++ b/EduSystemServer/EduSystemServer/settings.py
@@ -1,7 +1,7 @@
 """
 Django settings for EduSystemServer project.
 
-Generated by 'django-admin startproject' using Django 2.2.
+Generated by 'django-Eduadmin startproject' using Django 2.2.
 
 For more information on this file, see
 https://docs.djangoproject.com/en/2.2/topics/settings/
@@ -41,7 +41,7 @@ INSTALLED_APPS = [
     'Student',
     'teacher',
     'course',
-    'admin',
+    'Eduadmin',
 ]
 
 MIDDLEWARE = [
diff --git a/EduSystemServer/EduSystemServer/urls.py b/EduSystemServer/EduSystemServer/urls.py
index d16d836..8e2f8a4 100644
--- a/EduSystemServer/EduSystemServer/urls.py
+++ b/EduSystemServer/EduSystemServer/urls.py
@@ -19,6 +19,6 @@ from django.urls import path, include
 import API.urls
 
 urlpatterns = [
-    path('admin/', admin.site.urls),
+    path('Eduadmin/', admin.site.urls),
     path('api/', include(("API.urls", "api"), namespace="api")),
 ]
diff --git a/EduSystemServer/admin/__init__.py b/EduSystemServer/Eduadmin/__init__.py
similarity index 100%
rename from EduSystemServer/admin/__init__.py
rename to EduSystemServer/Eduadmin/__init__.py
diff --git a/EduSystemServer/admin/admin.py b/EduSystemServer/Eduadmin/admin.py
similarity index 100%
rename from EduSystemServer/admin/admin.py
rename to EduSystemServer/Eduadmin/admin.py
diff --git a/EduSystemServer/admin/apps.py b/EduSystemServer/Eduadmin/apps.py
similarity index 75%
rename from EduSystemServer/admin/apps.py
rename to EduSystemServer/Eduadmin/apps.py
index 5bbf122..715d7e1 100644
--- a/EduSystemServer/admin/apps.py
+++ b/EduSystemServer/Eduadmin/apps.py
@@ -2,4 +2,4 @@ from django.apps import AppConfig
 
 
 class AdminConfig(AppConfig):
-    name = 'admin'
+    name = 'Eduadmin'
diff --git a/EduSystemServer/admin/migrations/__init__.py b/EduSystemServer/Eduadmin/migrations/__init__.py
similarity index 100%
rename from EduSystemServer/admin/migrations/__init__.py
rename to EduSystemServer/Eduadmin/migrations/__init__.py
diff --git a/EduSystemServer/Eduadmin/models.py b/EduSystemServer/Eduadmin/models.py
new file mode 100644
index 0000000..c061404
--- /dev/null
+++ b/EduSystemServer/Eduadmin/models.py
@@ -0,0 +1,12 @@
+from django.db import models
+
+# Create your models here.
+
+
+class Admin(models.Model):
+    username = models.CharField(max_length=32, primary_key=True, name="username", verbose_name="管理员账号")
+    password = models.CharField(max_length=128, name="password", verbose_name="管理员密码")
+
+    class Meta:
+        db_table = "Eduadmin"
+        verbose_name = "管理员"
diff --git a/EduSystemServer/admin/tests.py b/EduSystemServer/Eduadmin/tests.py
similarity index 100%
rename from EduSystemServer/admin/tests.py
rename to EduSystemServer/Eduadmin/tests.py
diff --git a/EduSystemServer/admin/views.py b/EduSystemServer/Eduadmin/views.py
similarity index 100%
rename from EduSystemServer/admin/views.py
rename to EduSystemServer/Eduadmin/views.py
diff --git a/EduSystemServer/admin/models.py b/EduSystemServer/admin/models.py
deleted file mode 100644
index ff59ddb..0000000
--- a/EduSystemServer/admin/models.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from django.db import models
-
-# Create your models here.
-
-
-class Admin(models.Model):
-    aid = models.AutoField(primary_key=True, name="aid")
-    username = models.CharField(unique=True, name="username", verbose_name="管理员账号")
-    password = models.CharField(name="password", verbose_name="管理员密码")
-
-    class Meta:
-        db_table = "admin"
-        verbose_name = "管理员"
diff --git a/EduSystemServer/course/models.py b/EduSystemServer/course/models.py
index 9968df1..67b1b4b 100644
--- a/EduSystemServer/course/models.py
+++ b/EduSystemServer/course/models.py
@@ -1,5 +1,7 @@
 from django.db import models
 
+import Student.models
+
 
 # Create your models here.
 class Course(models.Model):
@@ -16,12 +18,13 @@ class Course(models.Model):
 
 
 class SC(models.Model):
-    sid = models.ForeignKey(to="Student", to_field="sid", on_delete=models.CASCADE, name="sid")
-    cid = models.ForeignKey(to="Course", to_field="cid", on_delete=models.CASCADE, name="cid")
+    sid = models.ForeignKey(to=Student.models.Student, to_field="sid", on_delete=models.CASCADE, name="sid")
+    cid = models.ForeignKey(to=Course.cid, to_field="cid", on_delete=models.CASCADE, name="cid")
     middle_grade = models.IntegerField(name="middle_grade")
     end_grade = models.IntegerField(name="end_grade")
 
     class Meta:
-        db_table = "admin"
+        db_table = "Eduadmin"
         verbose_name = "管理员"
-        verbose_name_plural = verbose_name
\ No newline at end of file
+        verbose_name_plural = verbose_name
+        unique_together = ("sid", "cid")
\ No newline at end of file