Deck erection gantry is specialized equipment for erection of suspension bridge deck segments,which has two forms of winch type and hydraulic lifting type. By analysing service conditions and performance index of the gantry and investigating the same kind of deck erection gantries at home and abroad, taking account of actual condition of steel box girder erection in Runyang Bridge suspension, new-type full hydraulic, modular, central-controlled gantry with wide range of application was developed.