Abstract: In order to solve the problems such as the damage of clasp hands and guide block in the use of the finishing mill with the 4 100 mm wide thick plate, an optimal resolution is proposed by checking the detailed structural and matching features of the guide device. The proposed measures were that the clasp hands of the guide device were redesigned from integral type into split type, adding bolt holes on the both sides of guide devices, fixing guide grooves to guide devices by stud bolts in accompany with the guide blocks of memorial archway, so as to achieve the antithetic use of the original convex and concave combining form. The structures of the clasp hands and guiding were rebuilt. The effect of the reformed guide device was more reasonable in the aspects of improving running stability, saving maintenance time, and increasing production efficiency.