In the present paper, the analysis of a normal shock wave with nonequilibrium upstream conditions in the water-vapour(wet steam) flow has been analysed theoretically and experimentally. The general flow equations in a water-vapour flow are formulated in the absence of the common assumptions of neglecting the rate of condensation and assuming equilibrium conditions prior to the shock. Also the flow properties through the relaxation zone have been obtained numerically. The results show that the behaviour of water-vapour flow through the relaxation zone behind the normal shock wave are mainly affected by the initial flow conditions pressure, droplet size, wetness fraction and the amount of subcooling. Measurements for the pressure distribution of the water-vapour flow through a convergent-divergent nozzle are also carried out. In a quantative comparison, the predicted pressure dis-tribution could have a good agreement with the measured one.