Channel siltation observation has been carried out since the construction period of the first phase of the 300,000 DWT channel of Lianyungang Port.It is found that the situation of channel siltation is better than expected by the observation and research on 250,000 DWT waterway of Lianyun port and 50,000 ton of Xuwei Port.Siltation reduction effect at the entrance section of Qitai breakwater is very obvious.Combination of sediment sampling,topographic survey,wind and wave data,using mathematical model calculation,the study of the laws and the mechanism of the channel siltation are further deepened.It can provide the technical support for research and design of 300,000 DWT channel phaseⅡ project of Lianyungang Port.