The Italian Football League A consists of 20 teams, which adopt a double cycle competition system (each team will play with other teams twice as a host and away team respectively). The calculation method of points in a single game is that the winner gets 3 points, the loser gets 0 points, and both sides get 1 point in a draw. At the end of the season, the points are ranked according to the accumulated points. If the points are the same, compare the results of each other first, and then determine the ranking according to the order of each other's goal difference, the number of goals between each other, the total league goal difference, and the number of league goals.