The class size imbalance of students registered for different classes in the same required subject presents a great problem at universities from the viewpoint of educational equipment use, educational effectiveness, allotment of time, ets. It is difficult to perform this work clerically when the number of registered students is large. In this paper, we developed a computer system to allocate the adequate number of registered students to various calsses according to their particular wishes. This system was applied to the allocation of atudents to physical education classes and satisfactory results were obteined.