32 teams are divided into eight groups, with four teams in each group. Each team can only play one game with the other three teams. The winner gets three points, the loser gets no points, and the draw gets one point each.
Group ranking is determined according to the following rules: a. If two or more teams have the same points, compare them in the following order to determine the ranking order: b. Compare the scores of several teams with the same points. If they are still equal, then: C. Compare the goal difference between teams with equal points. If it is still equal, then: d, compare the number of goals scored by teams with equal points.
If it is still equal, then: e, compare the total goal difference of the whole group match. If it is still equal, then: f, compare the total number of goals in the whole group match. If it is still equal, then: g, draw lots. The top two in each group qualify and enter the knockout stage. Among them, each group must kick off at the same time in the last round of two games.