Abstract: In order to analyse the wave loads on the 170 m × 170 m floating square array,the wave loads are calculated by SESAM in the environment of Poyang Lake,which is widely used in ship and ocean engineering. The wave loads on the floating square array are obtained under the regular wave with unit amplitude. The variation of wave loads along the rows and columns are studied. According to the results,under the extreme conditions of fifty year return period,the wave loads on the floating square array are calculated,which provide basic data for mooring design.