Taking a work area berth project as the background，some difficult problems in the water supply and drainage design of the bulk cargo wharf with the long approach bridge are discussed. By comparing the relevant fire protection codes，this paper offers the view of 3，000 m radius of protection about fire pump-rooms in bulk cargo terminal and the design of fire water pipe branch-shaped network for single approach bulk wharf. Aiming at the problem of the initial rainfall depth value of the bulk wharf，from the perspective of environmental protection，combined with the local rainfall data，an economical and reasonable value is proposed. The slope of the wharf drainage open ditch cannot be set due to structural reasons，so the calculation formula of the flat slope open drain is introduced.