The shaft soil resistance of pile may change in different situation. It is important to analyze the influence factors of it. The friction and adherence mechanics of shaft soil resistance of pile are analyzed. It is indicated that the main influence factors are the strength of pile-soil interface and the strength of soil. The strength of pile-soil interface include interface friction and interface adherence. Accordingly, finite element analysis of testing piles should include following content. First, to judge the destroy position in the pile-soil interface or in the soil by trial calculation. Second, if the destroy is judged to be in the pile-soil interface, a further calculate is needed to make clear the proportion of friction and adherence by presuming the friction coefficient. The ADINA program for pile analysis is introduce in the paper. A set of side friction testing results of a group of concrete short pile in middle weathered rock is analyzed using ADINA program to illuminate the analysis procedure.