The topography of Tongzhou Bay area is complicated,which is comprised of shoal-channel spaced in between.The current flows through the shoal at high tide and back to channel at low tide.Meanwhile,the seabed in Tongzhou Bay is powder sand,which is easy to both deposite and resuspend.Tidal current is the main dynamic in this sea area,which maintains the beach pattern of the sea area.According to the complex tidal current conditions in the beach,and taking First Phase of Harbor Basin No.2 reclamation of Tongzhouwan Harbor as an example,the tidal current conditions under different characteristics of different east embankments are simulated by using the mike21-Hd two-dimensional flow numerical model.This paper recommends the temporary construction length of the east embankment before flood to control the tidal current velocity at the dike toe.