During the construction of the dredger,a lot of sediment continuously enters the dredger cabin.If the process of sediment loading cannot be controlled reasonably,dredger may lose balance,which affects construction schedule and even causes safety accident.At the same time,the cabin outlet drains outwards and some part of the sediment is out of the cabin with the flow of water,which causes overflow loss.Reasonable arrangement of the loading operation is the key to ensure the safety of construction and reduce the overflow loss.MIKE 3 HD and MT model is used to simulate the process of sediment into the cabin,and calculate the sediment distribution in cabin and curves of loading capacity under different working conditions.According to the results,MIKE 3 model can simulate the loading well and run fast,which can be used to assist the dredger construction operation in advance control.