The standing tucked backward somersault is the most basic one of all performances. It is to be mastered before moving on the more difficult somersault for gymnasts and physical education students. The purpose of this study is to analyze the standing backward somersault and to give support gymnast and student in terms of biomechanical principles. The subjects were 4 male(skilled performer) gymnasts who were attending C highschool and 4 male(unskilled performer) students who were attending the department of physical education at C university in Kwangju city. The pictures of the movements of subjects were take with 16mm movie camera(64 frame/sec). Their motions were traced of the film and were divided with four stages : tuck and spring, take-off aerialpahse and landing and the torque, velocity, angular velicity for biomechandical analysis were calculated. The conclusions are as follow: 1. It is necessary to increase the vertical velocity and move the center of gravity of the body vertically at the tuck and spring movement. 2. It is necessary to increase the release velocity and gain as much angle as possible at the take-off movement. 3. It is necessary to increase the time of flight and increase the vertical distance of the center of gravity of the body at the aerial phase. 4. It is necessary to decrease the angular velocity and increase the angle of the kneejoint. In conclusion, performer should train sargent jump and tuck jump and must land near 30㎝ form the take-of place.