Abstract: This paper was written according to the results of several test piles in the south China.When loading begins on a pile. We may measure any measurement section's strain with straingauges which were presetted in the pile beforehand, and may calculate loading transfer curve of pile, i. e. the variations of lateral frictional force and pile point force with displacement. These are τ-S carve and Pb-Sb curve. They may be approximated by hyperbolic equation. Practically, These curves may be simplified by elastic-plastic model and elastic-harding model respectively, and five coeffieients λ, S（?）, K1, K2, and Sbu may be applied for the relationship of loading transfer of pile lateral force and pile point.In this paper, the writer proposed a method of equal pile point settlement for calculating P-S curve of pile. The result of calculation are fairly checked with those measured in the field.