Abstract: To study the effects of different widths of edge bearing surface on the mechanical properties of combined disc springs, a typical representative was respectively selected from each of the A and B series disc springs to compare and to analyze the errors of existing disc spring bearing capacity prediction formulas with experimental and numerical simulation results. Numerical simulation analysis was conducted to investigate the influence of the bearing surface width of different disc springs on the improvement of the bearing capacity. A total of 11 different types of disc springs were selected upon the three series A, B and C disc springs, and a large number of parametric analyses were performed upon the different bearing surface widths of each disc spring. Based on the results of numerical simulation for the same spring series, the existing formula in specification for predicting the bearing capacity of springs was modified by taking account into the bearing surface width. Eight different sizes of disc springs were subsequently selected, and the prediction accuracy of the modified formula was verified by numerical simulation and experimental results. The results indicate that bearing surface width has a greater effect on the bearing capacity of the disc spring. The modified formula can accurately predict the bearing capacity with different bearing surface widths, and have a good engineering practicability.