Due to the large error of the linear dynamic model for the opentype constant flow hydrostatic bearing, a nonlinear dynamic model of hydrostatic bearing is established. Based on the vibration response of hydrostatic bearings, the Fourier series method and the least square method(LSM) were used to identify the stiffness and damping of the nonlinear dynamic model. Meanwhile, some step excitation experiment were designed, and the vibration responses of various working conditions were obtained by using the developed experimental platform. Combined with the proposed nonlinear dynamic model of hydrostatic bearing and the method of parameter identification, the stiffness and damping of hydrostatic bearing were obtained. On this basis, the theoretical displacement response and experimental displacement were compared. It is found that coefficient of determination between the theoretical and experimental displacement is more than 097. Furthermore, this validates the fitness of the nonlinear dynamic model and parameter identification methods