The rake suction dredger sucks in sediment through suction pipes and transports it to the mud tank on the ship. This type of ship is suitable for operation in wide and sandy waters. The cutter suction dredger uses a cutter device to cut the sediment and transport it to a designated location through a mud pump and pipeline. It has strong excavation ability and is suitable for various complex water environments.

Dredgers usually adopt a multi-layer flat bottomed ship design, which has good stability and load-bearing capacity and can cope with various complex water environments. Sand dredgers, on the other hand, are usually designed with single-layer or double-layer flat bottomed boats, which have a relatively simple hull structure and mainly meet the needs of sand mining in waterways and other water areas. Dredgers are mainly used in water areas with silt accumulation, such as rivers, lakes, etc., with the main purpose of maintaining smooth navigation channels or clearing floating debris. And sand dredgers are mainly used in large-scale construction and earthwork projects, to excavate sand or soil for construction purposes.