Abstract: A compound cold-sizing process of a combined gear was proposed based on the principle of multi-directional die forging. Firstly, the process analysis of the combined gear was carried out, and different die structures were designed.Secondly, the Deform-3D software was applied to simulate the forming process under each plan, and the optimum die structure was selected by comparison. Finally, with the axial load and forming quality as the optimization goals, the orthogonal test method was applied to optimize the size of the blank before cold-sizing process. The results show that the floating structure of radial punch can reduce the maximum radial load by 31.5% and the axial load by 8%; the maximum axial load can be reduced by 16.1% by using the optimized tooth blank forming forgings, and the filling of the teeth after forming is full and without defects.