This article focuses on the process of shaping the mixed rifle with a large spiral angle in the cannon, and proposes a cone-like cathode structure with asymmetric cuneiform working tooth. The degree of cone, length and the angle of the cuneiform working tooth were determined experimentally and those parameters were matched well. An expert system of ECM is then implemented. As a result, control of voltage and electric current can be respectively applied to the convex line of the rifle at exit and middle part...