The principle of spread of water-hammer pressure-wave in pipeline is described,and in the condition of viscous friction of wall and fluid,2-equation model of water-hammer is established and simulated numerically and compared with the classical water-hammer model.The results show that in the process of water hamme,the value of the maximum pressure and period of two models in the valve are the same,which is 127m water column and 72s respectively.And the pressure of 2-equation model is gradually fading until disappearance.