Abstract: The RNG κ-ε turbulent model with wall-function law is firstly applied to simulate the flow of the reversible two-way passages pumping station.The incompressible N-S equations are solved by the finite volume method with a staggered grid in a non-orthogonal curvilinear system.The optimum function of outlet passage is proposed,and the numerical loss of head is given.A good agreement is achieved between prediction data with experience data.The RNG κ-ε turbulent model with wall-function law can be used to simulate flow field and loss of head in the passages of the pumping station.