Double-deck highway bridge with rigidity suspension stiffened three main trusses continuous steel truss bridge can take full advantage of the bridge location,share the bridge main structure and save the engineering investment.It is important to find out the ultimate load-carrying capacity of this type of bridge.Many scholars have done some researches overseas around the world.In this paper,a finite element analysis of the ultimate load-carrying capacity on double-deck steel truss bridge is carried out based on Dongjiang bridge.