Abstract: The selfbalance pile test has been widely used especially in pile foundation of a bridge and water pile foundation without space limitation, but there exists some shortcomings because of its own bear load mechanism characteristics. This paper examines the calculation and selection principle of friction coefficient which can decide the non-linear properties, considering non-linear interaction of pile-soil and developing the finite element model based on ANSYS contact element. Through a practical engineering case, the results with the finite element method are described. The results show that the finite element method has a higher accuracy and can truly reflect the curve of displacement of the top and bottom cells. An accurate model for the theory study of self-balance pile test is also provided.