A Longitudinal Comparative Study On The Technical Index Of Players In The Two Years Before And After The 2017 CBA System Reform

The Chinese men's basketball league(CBA)has been developing for25 years since it was founded in 1995.In the past 20 years of development,CBA league has made positive contributions to the development of local economy,the promotion of city image and the cultivation of reserve talents.The CBA has allowed the introduction of foreign players since 1996,which has increased the appreciation and excitement of the league.However,the excessive use of foreign players has restricted the growth and development of domestic players to some extent.In 2017,yao Ming was elected as the President of the CBA and made a series of reforms on the relevant competition system,rules and use of foreign players in the CBA,hoping to better train domestic players and promote the sustainable development of the CBA.Yao Ming came to power in 2017 has been for two years,this article will with the CBA official order manual only into the top 20 players as a benchmark(in the top 20 players more authoritative data)and system reform as the turning point,in 2017 compared to 2017 years ago two seasons after two seasons and four seasons change and the data of the top 20 players accounted,and calculate all the players ranking efficiency value and study the change,research conclusions are as follows:(1)Through the comparative analysis of the ranking of playing time of domestic players and foreign players before and after the reform of CBA competition system,it is found that foreign players are still the main force of the team in the current competition,with more playing time.The reform of the competition system in 2017 did not have a significantimpact on the proportion of playing time of domestic players in the league table of defenders and forwards,but the playing time of domestic centers increased significantly.(2)Through the comparative analysis of the attack index ranking of domestic players and foreign players before and after the reform of CBA competition system,it is found that the reform of the competition system in 2017 has no obvious impact on the proportion of domestic players in the ranking of total points and total assists,and only the total rebounds have a significant increase.From the point of view of each position player,after the reform of the game system,the number of domestic guard players in total points and steals on the list has increased,the number of center players in the list has increased.(3)Through the comparative analysis of the defensive index ranking of domestic players and foreign players before and after the reform of CBA competition system,it is found that the reform of competition system in 2017 did not significantly change the proportion of domestic players in the total steals ranking.From each position player's point of view,the game system reform has certain influence to the domestic center player's rebounding.(4)Through the comparative analysis of the league table of errors and fouls of domestic players and foreign players before and after the reform of CBA,it is found that the reform of the league table of errors and fouls in 2017 has a certain change in the proportion of domestic players in the league table of total errors and fouls,which is mainly reflected in the fact that the number of Chinese center players on the list of fouls and fouls has increased.It also shows that the extension of theschedule increases the antagonism and intensity of the league,and the appreciation of CBA league is enhanced.(5)Through the analysis of the changes in the ranking of efficiency value of domestic players and foreign players before and after the reform of CBA competition system,it is found that the reform of competition system does not significantly change the proportion of domestic players in the ranking of total efficiency value and average efficiency value per game,and the proportion of foreign players in the ranking of efficiency value is much higher than that of domestic players.However,in the difference analysis of total efficiency value,it can be seen that the increase of the competition schedule makes the total efficiency value of domestic players increase year by year,and the proportion of foreign guards and foreign centers in the efficiency value ranking of forwards,defenders and centers is much higher than that of foreign forwards,so the domestic players still get a certain degree of training.