This paper analyzes the sediment movement in Shicheng island waters in Zhuanghe,calculates the wave broken depth,sediment incipient motion depth and current velocity,demonstrates the dynamic causes for the deep trough of Shicheng island,and determines the principles for the general layout.Key parameters are analyzed for the layout of sand retainer jetty and border of land reclamation,and the siltation is discussed based on experience formula,numerical model and analogy of similar harbor sites.