Since 2013, the league comprises 16 teams. The winner and runner-up of the Persian Gulf Pro League and the Hazfi Cup champion are automatically qualified for the AFC Champions League group stage. The third of the Persian Gulf Pro League is qualified for the AFC Champions League Play-off round. The bottom two teams in the league are relegated to Azadegan League. In the past, the format and number of teams were changed for various times. Persepolis is the most successful club with six titles.