With the development of coastal economy,reclamation has become the main way to deal with the scarcity of land resources.The area of Haizhou bay tidal flat reclamation is large,and it’s close to Linhong estuary.So it may cause siltation in the river upstream,thereby affecting the region’s flood control and drainage.The tidal current field in Haizhou bay and adjacent seas is simulated by MIKE21,and the hydrodynamic changes,before and after the reclamation in the river are analyzed emphatically.Compared to the past,the average velocity of flood tide and ebb tide in the regions near reclamation area decreases,but the hydrodynamics in the river just change a little.The average ebb tide discharge of the feature sections along the river decreases after reclamation,but the magnitude of reduction is not large.The silting thickness in the river caused by reclamation is estimated to be about 2 cm by the analytical mode,which is based on river facies relation of Dou Guoren.It indicates that the reclamation does not have a great impact on siltation in the river downstream of the sluice.