Multi-span simply supported hollow slab bridge with continuous slab deck has the similar mechanical characteristics of simply supported girder bridge,with simple structure,convenient construction and free of expansion device,which all leads to the cost-saving in installation and repair of expansion device,and the amelioration of driving quality.Therefore,it has been applied in all parts of the world for quite a long time.With the increase of service period and the development of traffic volume,a large number of such bridges face the decrease in load carrying capacity and the inadequacy of design load.In order to improve the load-bearing capacity,safety and durability of these bridges,it is necessary to give them maintenance as well as strengthening.Taking a multi-span simply supported hollow slab bridge with continuous slab-deck as an example,this paper discusses the possibility and design method of the seamlessness and continuity transformation.