Hysteresis is a phenomenon common to a broad spectrum of physical systems.However,due to its non-linearity and non-analysis,the parameter identification of hysteretic nonlinear system is very difficult,which damages it's offectireness in engineering.This paper proposed a new parameter identification method based on miche genetic algorithm,which employed a new parameter named Radius,and a wood shear wall described by the BW model was simulated using this method.The simulation results were compared with the real values,and it showed a great promise of the present algorithm in engineering.