There are four teams in each group, and each team must play with the other three teams and only play one game. There are four teams in each group who play in round robin, and * * * plays six games (A1-A2; a 1-a3； a 1-a4； a2-a3； a2-a4； A3-a4), each game lasts for 90 minutes, and the winning, drawing and losing scores are 3, 1 and 0 respectively. The top two teams in each group advanced to the knockout 1/8 finals, and the *** 16 team was "top 16".