Abstract: The load transfer function method (LTFM) is a significant means of load transfer mechanism analysis of pile. The paper divides the soil body around pile into two parts, the elastic area and plastic area for the common action of pile soil. According to the law of linear increase of shear sthrength with the depth of natural ground, it gives the solution by the basic differential equation of load transfer function. And the practicability of the method is illustrated by the living example.