For the economic rationality of pile foundation design under complex geological conditions,such as exposed rock,shallow covering layer,karst development and deep layer of riprap,we present the design points of pile foundation under complex geological conditions through the analysis and research on the physical and mechanical properties of rocks combined with successful engineering cases.At the same time,due to the need of stable pile,sinking pile and subsequent treatment,the whole pile structure is adopted in the wharf.In order to meet the requirement of normal use,we put forward the effective measures to reduce the horizontal displacement of the wharf.The engineering example of this paper is guiding significance for the design of high pile wharf under similar complicated conditions.