Complicated as the bearing mechanism of super-long single piles is, it can guide the implementation of construction plans if pre-analyzed. This paper analyzes the vertical load transfer mechanism of super long single piles with 3D FEM, where the soil mass constitutive model is simulated with D-P Model, the concrete simulated with Linear Elasticity Model and the pile-soil interface simulated with contacting elements. It is revealed that super-long piles are friction piles and the bearing capacity should be controlled by the pile settlement.