Actual siltation observation of 150 000 DWT channel at Lianyungang port is carried out. Combining with the hydrologic and sediment data, we study siltation characteristics on perennial and windy days and influential factors.It is found that the siltation of 150 000 DWT channels is about 6 070 000 m3 per year, which is similar to the predictive value of the preliminary design phase. The distribution of siltation is similar to that in 70 000 DWT channel, the maximum siltation intensity of about 1.86 m/a locates at the outer section 1. The windy day siltation is characterized by 3 stages’variation and recovery later after primary siltation. The local siltation after wind is temporary, and the siltation needing dredging is very little. Based on the siltation characteristics of 150 000 DWT channel, we suggest that the breakwater at Liandao island entrances should be constructed during construction of the 300 000 DWT channel to reduce siltation at the peak section.