Abstract: In this paper, an H∞ optimal design method of stable controllers ensuring assigned region of closed-loop poles is presented. A method of obtaining controllers is described using real parameter optimization. The method fulfils engineering requirements on closed-loop behaviour, disturbance rejection and robustness as a whole. It is worth to mention that the method always gives a stable controller. This is important from the engineering point of view. Numerical examples show that a controller designed by the proposed method has good closed-loop behaviour, and that the disturbance rejection and robustness properties are not very much worse than that of any controller designed by the existing H∞ methods. Hence this method is applicable to practical problems.