Taking a high-piled wharf as an example,aiming at the problems of low efficiency of installation and construction of beam and slab on the sea and high construction cost of concrete pouring by mixing vessel on the sea under harsh sea conditions,technological innovation was carried out,such as bridge erecting machine to install prefabricated beam slab,pump truck to pour concrete on board,prefabricated beam using marble bottom tire and other new technologies and methods,which well avoided the influence of bad sea conditions on the installation of prefabricated beam slab and controlled the construction cost.