[Fixed]-Why uses South to do migration in Django?

You can still use South as a migration alternative for a Django 1.7 project. Although it’s recommended that you use the Django built-in migration functionality; you said yourself: you’re more familiar with the Django built-in than with South.

The Django documentation has an excellent guide to upgrade from South:
https://docs.djangoproject.com/en/1.7/topics/migrations/#upgrading-from-south

Follow the guide and you can remove South’s dependency from the project.