Abstract: This paper briefly provides the main content of the prevention technics on frost damage of the plain reservoir earth dam slope protection in cold region which is based on the studies of the frozen soil mechanics and the ice engineering in the recent years. They maybe the references for the engineers because the contents widely include frost damage laws of the plain reservoir earth dams, frost damage prevention methods of the slope protection, prevention methods of the frozen ice, the design parameters determination of resisting the frost heaving and the stabilization calculations of resisting the ice thrust etc.