The trailing suction hopper dredger is such a kind of construction ships with high energy consumption. By the study and application of energy-saving technology, not only the fuel costs could be saved, also the environmental pollution caused by ships could be reduced, therefore both economic and environmental benefit could be achieved. By introducing the definition of energy conservation and evaluation of the trailing suction hopper dredger, this paper discusses the energy-saving technology and present application status of ship design, power equipment, the development of dredging machinery and integrated monitoring system, and construction of single suction pipe dredgers.