It introduces the transportation and erection technology of large-tonnage railroad girders under complex environmental conditions. The rail girder weighs 190 tons, choose French Williams TG300 locomotive and French NICOLAS trailer to transport the girder, the transportation line is to pass through the busy canal, using the open type lifting trestle to solve the contradiction that the girder carriers pass on top, and the following continues to be navigable. When erecting the girders, the gantry girder erection machine specially designed and made for the general area is used; the gantry girder erection machine and the combination of the special area is used, and the erection purpose is achieved through the longitudinal and transversal movement.