Based on the hydrological sediment test and remote sensing image data,this paper analyzes the characteristics of sediment in the southwest of Hainan Island,calculates the amount of sediment in the sea by using different coastal sediment transport formulas,and studies the evolution of the beach by using the measured terrain data for many years.The results show that the tidal volume in the sea area is greater than that in the small tide,but the total suspended sediment content is low.The influence of the sediment transport in the study area is limited,but the influence of the coastal sediment transport is relatively large.The sediment transport capacity is in the range from 67.2 thousand m3to 133.1 thousand m3;the main driving force of the shore beach evolution is the wave,the change of coastline and tidal current caused by the interaction between the coastal flow and the tidal current led to the change of the coastline under the jurisdiction of the city,but the scouring and silting intensity is limited.