Based on the measured data,we study the hydrodynamic characteristics of Dushan shallows and evolution features of the shoreline.Based on the analysis of the survey data in sea bottom of 2005 and 2013,we study the erosion deposition variation of Dushan bank and changing trend of the deep groove during the past 3 years.The results show that the north of Hangzhou bay coastline tends to be stable,Dushan bank region bias deposition,and the deep groove tends to move outside.