Abstract: With the aid of finite element analysis software MSC.Marc, the process of break-down rolling of large H-beam with profiled billet was simulated, and the deformation characteristics of workpiece were analyzed. The results show that deformation of different parts of workpiece is inhomogeneous during rolling, the deformation of flange and web is inconsistent. The "tongue" in the site of the web is caused by the uneven extension of various parts of the workpiece; and the thinner web site leads to the slope instability in the rolling process. It is significant to develop a proper pass system for large H-beam rolling.