Abstract: Aiming at two kinds of coupling problems in flatness control of a UCMW cold tandem mill, the coupling between edge drop control and flatness control and the controlling efficiency coupling between work roll bending and intermediate roll bending, the coupling degree parameters is defined to quantitatively express the coupling degree. A method for decoupling the two kinds of coupling problems was proposed by designing the end contour of intermediate rolls. The end contour of intermediate rolls was designed for a 1550UCMW cold tandem mill. Simulation results showed that the designed end contour of intermediate rolls decoupled the two kinds of coupling relationships in certain degree, and the mill could be further optimized to improve its flatness control performance for enhancing the physical shape quality of products.