Abstract: The support method is one of the important factors affecting the rigidity of the bed of a precision machine tool, and good machine tool rigidity is of great significance to the improvement of the overall machining accuracy of the machine tool. In order to improve the dynamic and static characteristics of the machine tool, a support method of double three-point support plus auxiliary support is proposed based on multi-objective optimization method and finite element calculation, and a precision horizontal machining center bed is used for detailed verification. The research results show that the support method designed by the multi-objective optimization algorithm increases the first-order natural frequency by 15.29% compared with the commonly used support method in engineering, and the average deformation of the forward and rear guide rails of the X-axis is reduced by 59% and 6%, respectively, which verifies the effectiveness and correctness of the proposed method.