A general analytical formula of large deflection for annular throttle-slices in shock absorbers was deduced.The Chien-perturbation method was used to derive the stiffness curve equation of a single throttle-slice in shock absorbers.The analytical formula of large deflection for superposed throttle-slices was deduced directly and generalized.The undetermined coefficients of analytical formula were obtained through the finite element method (FEM) and curve fitting.Numerical results show that the analytical formula has satisfactory accuracy.