Abstract: Taking typical soil-rock dualistic structure geological conditions in Fujian region as background,this article analyzed and compared for selection of retaining and sealing scheme of deep foundation pit,introduced the approximate design and calculation method of gantry anchor pile in soil-rock dualistic structure.According to the field deformation monitoring results of foundation pit,gantry anchor piles supporting system is practical in soil-rock dualistic structure geological conditions;has obvious advantages of effectively control the deformation of foundation pit,constructing in limited space and geological conditions which is not applicable to construction of anchor etc;provides reference for the design of deep foundation pit supporting in the area of similar soil-rock dualistic structure geological conditions.