In order to solve the filling dissatisfaction and damage factor too large and other defects of balance shaft in the forging process, The research object is the balance shaft of a certain vehicle, a quadratic polynomial response surface model with the blank preheating temperature, die preheating temperature and pressure speed of press as design variables and the forming load and damage factor as targets was established. The response surface model and finite element method were combined to optimize the forming process parameters of the balance shaft,and the optimal technological mold speed parameters are obtained as follows: the blank preheating temperature is 1198 ℃, the mold preheating temperature is 277 ℃, and the pressure speed of press is 49 mm·s-1. The experimental results show that the forgings produced by this process combination have no damage defects and the forgings are completely filled, which provides reference and basis for the design and optimization of forming process parameters of the same type of forgings.