Abstract: According to the measured wave data of Dongfang Ocean Gauge Station in the southwest coast of Hainan Island, wave models were set up and calibrated. The models were utilized to simulate the wave field and get the breaking wave parameters along the coast of the Basuo new port. Based on those parameters, the longshore sediment transport rates at different cross sections along the coast were calculated with three different formulas including Seaport Hydrology Criterion formula, CERC formula, and Sun formula. The longshore sediment transport rates along the coast of the Basuo new port were analyzed and compared before and after the construction of the breakwaters. The respective contributions of the wind wave and the swell wave were also analyzed in this study. The analysis results show that the ability of the longshore transport sediment to the north is greater than that to the south; and the longshore sediment transport rates contributed by the wind wave and the swell wave are close to their occurrence rates respectively. The deposition intensity along the south side of the Basuo new port is higher than that along the north side. The domains and effects of the longshore sediment transport rates caused by the breakwaters increase with the increase of the length of the breakwaters.