Abstract: Compared to the stem shaped explosively formed projectile (EFP), the quasi-spherical EFP represents the advantages of insensitivity to the flying attitude, better penetrability and enhanced aftereffects. In this paper, a verified numerical model was used to study the influence factors of charge length-diameter ratio, liner inner radius, liner outer radius, and liner central thickness on the evaluation indexes of EFP velocity, specific kinetic energy and length-diameter ratio, aiming to develop a new formation method based on a non-uniform liner. The results show that the relative formation rules are different from that of the spherical EFP with baffle ring and that of the long EFP with the same liner and charge structures. The explosive formation process with quasi-spherical EFP is simple and the shape and the penetrability of the EFP can be improved. This research can provide valuable references for the design and optimization of quasi-spherical EFP.