From a technical point of view, Liu is considered to be the representative of China's traditional straight and rubber play, and the first person in the world to play straight and cross. Kong, on the other hand, combined the styles of China and Europe according to his own characteristics, and formed a new all-around style of play, becoming the first horizontal racquet player in China.

Kong * * * has won eight world championships, but he still lacks two championships, one is the mixed doubles champion and the other is the World Cup team champion.

Judging from the singles results, Kong is the only player in the world who won the men's singles championship in four world-class events: the Olympic Games, the World Championships, the World Cup and the World Professional Tour Finals. Compared with him, Liu lost a title in the finals.