Abstract: Pump system steady operation research is the prerequisite of water system economic and reasonable operation, it provides the initial value of water system hydraulic transient process calculation, the basis of optimal regulation,the interface of automatic control.The mathematical model of single pump with single tube steady operation and paralleling pump steady operation is established.By making numerical simulation of Zhangze pumping station water system steady operation under four working conditions and hydraulic transient process,it points out that this pumping station operation efficiency is low and needs optimal regulation.