Through inversion analysis of pile testing data at three sites, the author has concluded as follows. The lateral and tip resistance of sandy soil can be determined according to the code by the density, after adding 5 strikes to the standard penetration test, and the tip resistance becomes higher as the pile gets deeper into the supporting course. As for the upper Pleistocene cohesive soil, the lateral and tip resistance can be determined according to the code after raising the liquidity index by one or half a level. In addition, the lateral resistance of the Holocene cohesive soil and the upper Pleistocene silt can be determined according to the code directly based on the origin liquidity index of density.