Abstract: A method for calculating design tide levels is presented for the planned projects in the area where tide levels are hard to measure Firstly,a short-time tide process at the planned project site,that it is more than a month,is obtained by means of the tidal current numerical calculation.Secondly,the synchronization correlation analyses are carried out.By comparing the tide levels at the site with those at a nearby harbour or tide station with long-term measured data,the regressione quations are established.Finally,the design tide levels at the harbour or tide station are calculated by using the method of Code of hydrology for Sea Harbour,and the design tide levels at the site are obtained through the regression equations.The results show that the method proposed in the paper is reasonable and feasible.