Abstract: In this paper, a great quantity of computation on the pile bearing capacity are made by using the wave equation computer program with successively varying input parameters. The effect of each parameter on the pile bearing is analysed. It is shown that all the parameters can be classified into two groups: the intrinsic parameters held by the pile-soil system and the auxiliary parameters held by the pile-hammer system. The intrinsic parameters, including the quake of soil, the visco damping coefficient, the elastic moduli of pile material, the cross section area and the length of the pile, play the dominant role in the determination of the pile bearing capacity. The auxiliary parameters, including the hammer weight, the hammer fall, the spring constant of the cap-block, the coefficient of restitution of cap-block and pile-cushion, and the efficiency of the hammer, etc., only influence the curves Ru = ｆ(S) or Ru =ｆ(N) but not change the value of the actual bearing capacity of the pile. From the analysis it is also indicated in the paper that the quake value of the soil, besides the intrinsic parameters held by the pile itself, is the mast influential factor on the pile bearing capacity.