A survey on 42 national male volleyball athletes from 6 A-class club teams shows that the highest injuries are the parts of knee joint and waist muscle,and it is the mainly injuries in fingers,ankle joint,wrist joint and muscles.

With the rapid development of modern man volleyball sport,the body constitution is increasingly becoming a basis and guarantee for those outstanding players to advance and give a better play to their skills and tactics.

With the literary data about volleyball and his training practice, the author analyzes the changes in the skill of smashing from back row in man volleyball based by the theory of sporting biomechanics and sets up a new model for the skill of attacking from back row, which could be used as a theoretical guidance in increasing the joint attack in man volleyball.