Sun Jun was born in a basketball family, and his parents are professional basketball players. At the beginning of 1986, Ma Jiaduo, then head coach of China Youth Team, transferred Sun Jun, whom he met at the National Youth Championship, to the team and began his years of serving the country. A year later, Sun Jun was selected for the new national youth team and played a major role.

1989 1 Manila, the national youth team won the Asian youth championship after more than a year of training (at this time, the head coach was replaced by Jiang Xingquan). Sun Jun played almost eight games, averaging 20 points, which is one of the core of the team. At this time, Sun Jun's height has grown to1.97m, and his touchdown height is between 3.50m and 3.60m, and he often performs dunks in usual training and competitions.

Sun Jun won his first adult intercontinental championship in the Kobe Asian Championship in 199 1. He was the main force of the national team in this competition and retired from the national team after 2000. He has always been the main force of China men's basketball team. On the night of winning the championship, the China team and the China Taipei team raised their glasses in the hotel to celebrate. The old players who are familiar with each other and the young players who have dealt with the youth team put aside the distance between the straits, raised their glasses and drank, and sang and laughed.

1995 After the quarter-finals, Guangdong Hongyuan's boss found Sun Jun and made an extremely generous offer. There was no document about the transfer at that time. The Jilin team was afraid that he would never return, so they reported the situation to chinese basketball association, and the Basketball Association forced Sun Jun to stay in Jilin. 1997 after the CNBA league, Beijing entrusted Bater and Jiangsu entrusted Hu Weidong, hoping that these friends can do the work of Sun Jun; Hai, the boss of Shanghai and Guangdong, found him and called Bayi.

Later, Li Su, the Austrian God, found Sun Jun and proposed that as long as he joined, he would settle down in Changchun, and the management right and income would go to the Northeast Tiger Club, with a personal treatment of at least 500,000 a season. This is a generous offer that you can't refuse at all. At the time of signing the contract, Zhang Aijun, general manager of Northeast Tiger Club, specially added: If Jilin team enters CBA, the contract will be automatically invalidated. As a result, in September, the news of the dissolution of the Air Force came.