The present invention firstly cuts the different metal materials into specificsize plates, the different material multilayer sphere-inscribed polyhedron shells are welded layer by layer, then the explosive with specified parameters is put on the assigned position in the shell, and the explosion energy is transfered through water to the metal plates, meam while the combining of different materials and sphere forming are completed simultaneausly. The compound sphere, ellipsoid, and drop-shape spheroid produced by said invention have production cost 1/6 and production period 1/20 that of same compound shell made by the traditional technology.