Based on the unit force method,this paper gets the internal force results of each main force support component of one inland vertical-faced wharf under calculating the action of a variety of conditions of the wharf’s three dimensional structure model,and by the combination and searching for the force results through MATLAB program,eventually 90 177 536 kinds of main effect combinations may appeared in 3D structure of vertical-faced wharfs in inland rivers are simplified to 14 kinds.This method and thinking greatly reduces the calculation workload.It can be applied for structure’s calculating and analyzing in vertical-faced wharfs in inland rivers.