Synthesis of the controller of ITER plasma stabilization system is considered. Stabilization system is based on tokamak diagnostic measurements, defines the voltages in tokamak coils and has the filtering properties. Known methods of synthesis of plasma regulators are advanced by the presented optimization approach. It makes possible to meet the requirements for the dynamics of the stabilization process when considering a set of some arbitrary plasma drops and disturbances. The proposed approach evaluates the ensemble of transient processes of the closed object. Based on this estimations it is possible to use wide range of optimization techniques.