A numerical simulation method by computer is present in order to solve the problem during the shaped charge blasting. Numerical simulation of the conical shaped charge jet formation process is made by use of the explicit dynamic finite element analysis program. The distribution character of velocity of shaped charge jet is analyzed, and the results between shelled model and no shell one are compared. The results of numerical simulation are in agreement with physical phenomena and laws of jet formed by conical shaped charge blasting. The study indicates that the calculation model and simulation method are reasonable and feasible, which may be a reference to manufacture and scientific research of perforating bullet.