The effect of temperature of the rolls from 2 degreesC to 110 degreesC in the warm roll process at 350 degreesC has been investigated in an attempt to refine the structure of the 7475 based aluminum alloy sheets including Zr. A lower temperature of the rolls leads the alloy sheets to coarser grain structure after solution heat treatment. On the contrary, in the case of a higher temperature of the rolls, the subgrain structure less than 3wm is formed uniformly through the thickness of the sheets after solution heat treatment with the strong Brass texture component. The sheets consisting of fine grain structure have a higher strength and a high plastic strain ratio in 45 to the rolling direction.