diff --git a/contest/models.py b/contest/models.py
index 1e4f45a..2708bcf 100644
--- a/contest/models.py
+++ b/contest/models.py
@@ -120,6 +120,9 @@ class ContestRank(models.Model):
     # key 是比赛题目的id
     submission_info = JSONField(default={})
 
+    class Meta:
+        db_table = "contest_rank"
+
     def update_rank(self, submission):
         if not submission.contest_id or submission.contest_id != self.contest_id:
             raise ValueError("Error submission type")
diff --git a/group/models.py b/group/models.py
index b399246..a2db074 100644
--- a/group/models.py
+++ b/group/models.py
@@ -37,5 +37,6 @@ class JoinGroupRequest(models.Model):
     # 是否处理
     status = models.BooleanField(default=False)
     accepted = models.BooleanField(default=False)
+
     class Meta:
         db_table = "join_group_request"
diff --git a/problem/models.py b/problem/models.py
index adb7dd4..331f003 100644
--- a/problem/models.py
+++ b/problem/models.py
@@ -45,6 +45,7 @@ class AbstractProblem(models.Model):
     total_accepted_number = models.IntegerField(default=0)
 
     class Meta:
+        db_table = "problem"
         abstract = True