Abstract: The observer condition in the observer-state feedback control system is an essential condition for the observed states to asymptotically approach the real states. In this paper, a parametric approach for the design of Luenberger observer is proposed, and the problem of robust Luenberger observer design for systems with parameter perturbations is then considered based on the criterion of minimum observer condition error. A simple and effective algorithm is given. Simulation results show the effectiveness and application value of the proposed approach.