At present,tandem pump construction as main construction scheme of long line is widely used.Aimming at how to match the transport capacity of the mud pump,and how to achieve stable operation and to play a reasonable production capacity,taking 50 million t/a of coal wharf project of Huaneng Caofeidian reclamation project as an example,this paper explores the changing trend of construction and analyses the reasonable decorate range of pump vessel through the classification and calculation of all kinds of typical operating conditions of the construction.