diff --git a/backend/account/apps.py b/backend/account/apps.py
index bd9c0fd..f0b161e 100644
--- a/backend/account/apps.py
+++ b/backend/account/apps.py
@@ -4,4 +4,6 @@ from django.apps import AppConfig
 class AccountConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'account'
-    verbose_name = 'اکانت'
\ No newline at end of file
+    verbose_name = 'اکانت'
+    def ready(self):
+        import account.signals
\ No newline at end of file
diff --git a/backend/account/models.py b/backend/account/models.py
index 559ef0d..e0e389a 100644
--- a/backend/account/models.py
+++ b/backend/account/models.py
@@ -129,7 +129,7 @@ class UserAddressModel(models.Model):
     city = models.CharField(max_length=30, verbose_name='شهر')
     province = models.CharField(max_length=30, verbose_name='استان')
     for_me = models.BooleanField(default=False, verbose_name='برای خود کاربر')
-    is_main = models.BooleanField(default=False)
+    is_main = models.BooleanField(default=False, verbose_name='ادرس اصلی کاربر')
 
     def __str__(self):
         return f"{self.user.phone}, {self.name}"
diff --git a/backend/account/signals.py b/backend/account/signals.py
new file mode 100644
index 0000000..d7d47d9
--- /dev/null
+++ b/backend/account/signals.py
@@ -0,0 +1,10 @@
+from django.db import transaction
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from .models import UserAddressModel
+
+@receiver(post_save, sender=UserAddressModel)
+def ensure_single_main_address(sender, instance, **kwargs):
+    if instance.is_main:
+        with transaction.atomic():
+            UserAddressModel.objects.filter(user=instance.user).exclude(pk=instance.pk).update(is_main=False)
\ No newline at end of file