According to the characteristics of production technology of skin-passed galvanized strip,a mathematic model that design the roll shape of hot galvanizing temper mill is construct.

the effect of roll bending, roll shifting, roll segmented cooling and roll curves on the flatness control of cold - rolled wide strip steel has been taken into account in this system and the whole flatness theory system was set up.

The Ganglu 1 250 mm hot strip mill was studied,the entry strip crown and the exit strip crown of each finishing mill were decided through reasonable distribution of crown of each finishing mill,and the roll contour was optimized by a roll contour optimization and design algorithm which is based on the influence function method.