According to yesterday's lottery, the teams of 16 belong to four groups: A, B, C and D respectively. In the first stage of the competition, the top three in each group can enter the second round. In the second round, 12' s team will be divided into two and a half areas, in which the top three of Group A and Group B are in the same half area, and the other half area is the top three of Group C and Group D. In the second round, each team will play against three teams that are not in the same group in the first round. At the end of the two cycles, the 12 team that entered the second cycle ranked the top four in two and a half regions according to the total scores of six games, and entered the knockout stage, from the quarter-finals to the final third place.