The analytic method for pile foundations by means of elasto-plastic finite element method based on vertical loading test was proposed. The ground element including around pile top is taken as an elasto-plastic material which rigidity is changed with the increment of strain, and the pile skin friction model is supposed as elasto-plastic model. In the pile vertical loading tests this method is effective on the pile quantitative and qualitative analysis that are about characteristics both settlement and transmission of the axial force. That is possible to precisely recreate actual settlement characteristics by this method.