Based on the measured hydrological data and several topographic maps，we analyze the back silting characteristics of 35，000 DWT navigation channel at Sheyang Port. The results show that the sea area where Sheyang Port is located is influenced by the sediment transport of the ancient Yellow River Delta，which has a high sand content and provides a rich source of sediment for the siltation of the channel；the annual siltation of the inlet channel is 9.95 million m3，of which the section covered by the guide dike accounts for 93% of the total siltation of the channel，and the average siltation intensity of this section can reach 5.0 m/a，which is higher than that of the open sea section of 0.6 m/a. The siltation of the channel in the section covered by the guide dike is mainly due to the high sandy water brought in during the high tide period，which also contributes to the siltation of the channel.