This paper presents a new surface for improving the nozzle blade C-9015A of wet-steam turbines in modern power plants by increasing the efficiency of the moisture separator in the last stage of the turbine. This may be done by putting a grooved surface on the nozzle surface against the impact of droplets and accumulation of deposition due to the impact of droplets on the holes of the separator increases. By placing the groove on the surface of the nozzle, the hole into the grooves transfers the moisture deposited on the blade’s surface into the blade and sent to the root of the nozzle. Placing the grooved surface of the nozzle blade increases the erosion of the nozzle blade because the angle between the impact of the drop and the grooved surface is increased, and the erosion energy of the blade has a direct relationship with the angle of impact of the drop. In this article, the best angle between grooves is suggested so that the erosion energy of the nozzle surface does not increase compared to its initial smooth surface state.