Research conclusions：(1)The internal force calculation and deformation of foundation pile are based on the structure unit, foundation slab and pile are treaded as a whole, and think that foundation slab，pile and foundation can coordinate deformation in the upper loads and the elastic resistance of foundation. The calculation method can better reflect the characteristics of foundation pile in stress and deformation. (2) Pile space in the vertical retaining wall is magnified on resisting lateral deformation, so the distance from pile edge to the bottom edge should be controlled to meet the minimum construction. (3) Alternative framework method adopted in foundation slab greatly simplifies the calculation work, the results of alternative framework method is reliable.(4) The cantilever retaining wall with pile foundation can avoid the adverse effect of excavation and ground improvement on existing subgrade, and greatly reduce construction interference on movement of the train, the retaining wall has higher comprehensive economic and technical benefits.(5)The research results can be promoted and used for the design of retaining wall which is limited with construction space and lower sub grade bearing capacity.