Lianyungang port deepwater channel is the typical case of the deepwater channel of muddy shoal in open waters. Siltation law and practice show:The siltation intensity which accounts for about 60% of total annual siltation amount of middle wave day is the main part of the channel siltation.Due to obvious interannual variability of middle wave frequency,the range of siltation amount is large.Wave classification has not been considered by all existing siltation calculation mode.It is proposed innovatively that deepwater channel siltation prediction method for muddy shoal in open waters,which is“based on the siltation intensity of three generalized wave levels,gets the design siltation amount according to each wave level frequency.”The method can reasonably reflect the effect to siltation of year-round wave intensity and wave level frequency range in different years.And it significantly improves the forecast accuracy of design siltation amount.It provides a scientific basis for ensuring the deepwater channel siltation amount and range prediction,the channel stability and technical feasibility research.It had been verified by 250 000 DWT of Lianyun port waterway and 100 000 DWT of Xuwei port waterway engineering practice.The deviation between prediction and actual amount is less than 25%.