This year's 12 teams will be divided into three groups for single round robin, and the top two and the two best third places in each group will enter the quarter-finals. If the scores of two or more teams are the same (including the third place in the group), the scores, goal difference and goals won will be compared in turn according to the order of group matches, and the final decision will be made by the preparatory committee by drawing lots if there is no difference. If the same team involves the best third place, compare it with the difference between the ball and the winning ball, and draw if there is no difference.