Automatic design is just going to advance to optimal design and this is the last target to take use of computer. The design is a process to get the best combination of design parameter; is a system enginearing. This is equal to get the summit of objective function in plural parameter space. In the optimal programming at management，linear programming and dynamic programming is much used. Modified function and objective function is generally complicated nonlinear function，so the design calculation caluclate on nonlinear programming. In this report，using of the gradient projection method，indicate the program of the gradient projection method in order to solve the nonlinear problem.