This paper consider the robust control for the temperature of the aluminum plate by using operator-based robust right coprime factorization method.Firstly,the nonlinear mathematic model with unknown perturbations is factorized by using isomorphism method,and then the robust controllers are designed to guarantee the nominal Bezout identity and the real Bezout identity to be satisfied,therefore the uncertain nonlinear system is robustly stable,the simulation results are given to show the validity of the proposed method.