Aim\ To advance the initiating capability of booster pellet
and to solve the initiation problem of insensitive ammunition. Methods\ The shock initiation theory of explosives is used. Results\ Two kinds of concave spherical structure of the booster pellet were designed. Conclusion\ Contrast experiments between the initiating capability of new structure and that of cylinder were made by using varied composition method.Experimental results state that the initiating capability of new structure is 20%~30% greater than that of cylinder.