For the particularity requirement on a Vshaped anvil forging tools to the bar sizing process, based on 90° Vshaped anvil, its structure was improved, and 135° Vshaped anvil was designed to meet the process requirements of Vshaped anvil forging tools to bar sizing process. Then, the forming bars on the two kinds of Vshaped anvil were simulated by Forge software including the forming effect of bar, the equivalent stress and equivalent strain fields after forming of bar, and the influence of Vshaped anvil on the anvil surface under the coupling effect of thermal stress and compressive stress in the process of bar forming was simulated mainly including the coupling equivalent stress on Vshaped anvil and the wear of anvil surface in the forming process. By comparing simulation results and theoretical analysis, it is concluded that not only the structure design of 135° Vshaped anvil meets the technological requirements, but also the stress, strain and wear are smaller than that of 90° Vshaped  anvil.