As we know, the factorial experiment is widely used today. When the interactions among some factors concerning the experiment are negligible, the orthogonal experinaentat design is a rapid and efficient method. In this paper, the L_t~u(t~q) orthogonai arrays are analyzed and the method of compiling the orthogonal arrays and their interaction tables by computer are studied. Based on this work, the general software with complete functions is designed. This work will help the engineers and technicians to arrange the experiments reasonably, even if they are not familiar with the theory of experimental designs.