For shooting, it generally divides into fixed target and clay-target two cases. Firstly this paper researches on fixed target, make force analysis of bullet, it can know that it takes constant motions in horizontal direction and constant decelerated motions in vertical direction. Make calculation by vertical direction displacement, displacement equation and horizontal displacement equation, get included angle between bullet speed and ground as well as relational expression of distance between front sight and fixed target. In fixed target shooting, shooters can decide the included angle size that formed by speed and ground according to target distance. The next for clay-target competition, this paper uses laminar flow model to make force analysis of clay-target, it can know that the clay-target takes constant deceleration motions both in horizontal and vertical directions. Clay-target bullet force status, speed changes following by time equation, as well as ballistic trajectory are the same as those in fixed target researches.