Research conclusions:The beam bending moment，the longitudinal horizontal displacement of piers and the bending moment of pier cross—sections of long connecting，high pier，large—span and dissymmetry continuous rigid—frame bridge are all dissymmetry．The closure thrusting can obviously decrease the bending moment on the top and bottom of piers．The decreasing range is not only relative to the pier stiffness，but also to the distance between piers and the zero displacement point．Wether the closure thrusting force is loaded or not has little effect Oil the beam bending moment．Forthis type of bridge，if the closure thrusting is needed，the closure sepuenees from the mid—span to secondary side span to side span should be followed，which can lower the closure cost and speed up the construction process．When thrusting，the reinforcing steel bars and the temporary memberfl for fastening two ends of cantilevers in the closure area should not be welded each other and should be kept horizonally movable．If the ratio between the side span and the mid—span is large，the effective action must be kaken to prevent the crack of web of the beam．Because of needing the load on the structure after closing，the permanent cross girders on side piers should not be installed，but temporary cross girders are necessary for the stability of hish piers in the stage of cantilever construction．