Aiming at the problems that underwater drilling construction of hydraulic hammer can not be visualized and construction parameters are difficult to determine，ABAQUS simulation platform is used to simulate underwater hydraulic hammer drilling，and the design of drilling construction parameters is theoretically studied.The impact energy of different types of hammer has a great influence on the drilling speed.To obtain the ideal construction efficiency，the hammer type should be selected according to the rock parameters.It is found that the splitting effect in two directions is produced under the condition of three free faces.With a small increase in the spacing of drilling holes，the penetrating depth does not change，but the depth produced by the splitting effect changes greatly.when the requirement of the channel dredging smoothness is high，the construction efficiency and quality can achieve the ideal effect by selecting the hole layout parameters corresponding to the depth of penetration and the depth of the splitting effect.