The high temperature wear behavior of Ni-Grain roll materials applicated to finishing work rolls for hot strip mills has been investigated. Experiments have been conducted with hot rolling simulator up to 1.25 × 10⁴ revolutions, and the deterioration of roll surface was analysed. The procedures of the deterioration of roll surface were cleared. During the early stage of hot rolling, surface of work roll is covered with the even black film formed by oxidation of roll material at high temperature, followed by banding of the black film and then the wear resistant carbides surrounded with matrix are emerged by being worn out of the matrix during successive rolling. The emerged carbides induce the phenomina of sticking, rolling material stuck to roll surface, by the evolution of uneven friction heat and then the particles stuck on the roll surface are disappeared by the successive wear during hot rolling. v