Abstract: The work roll grinding contour of non-oriented silicon steel hot rolling is dependent on the work roll thermal contour heavily which will lead to an unexpected initial work roll contour under normal roiling condition. To resolve this problem, considering the condition of non-oriented silicon steel rolling, a work roll temperature field model during rolling was constructed by using the 2-D finite difference method and a work roll temperature field model after rolling under air and spray mixed cooling condition was developed by using the finite element software ANSYS. Based on these models, the work roll temperature field and thermal contour through the whole non-oriented silicon steel rolling process were researched numerically, and a hot grinding mathematical model and its schedule were proposed and applied in industrial production. Under the same condition, after applying the new work roll hot grinding mathematical model and its schedule to non-oriented silicon steel strip rolling of 1700 mm hot strip mills, the qualification ratio of crown and wedge increased from 67.39% to 74.57%.