| The span of sport life is a complicate, developing and systematic process, and the length of CBA athlete's sport span reflects our country's basketball level. It is the most valid means of promoting our basketball level to prolong current players' sport span because the lack of reserve. This thesis theoretically analyzed the concept of sport span and did a comparison research on the age of both CBA and NBA athletes. The result shows: sport span means the period from accepting the professional sport training to terminating the career, the result of this research points out: the average age of CBA player is 25.0±3.79 years old, but average age of NBA player is 29.16 ± 4.01 years old, and there is a 4.16 years difference.( P<0.01)This research, based on previous theories of sport-life span, sport training, sport psychology, sport physiology, sport dietetics, sport genetics, sport medicine etc., selects 7 primary indexes, which include training factor, accident factor, dietetic factor, medical factor, social factor, psychological factor and genetic factor to be the main causes affecting CBA players' sport span. Experts confirm all the second indexes which are based on primary. The purpose of this research is to find the main factors affecting CBA players sport span, and to provide basic theories on prolonging their sport span.
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