The headstock of high-speed vertical machining center is taken as the object of study the finite element model is established based on structural features taking advantage of ANSYS Workbench.

The FEM(finite element method) of the main shaftclamping apparatus-cutter system for DMU-70V NC high speed machining was built, and the results of the FEM were validated using dynamic test.

Based on the dynamic simulation of the spindle system of 5-axis machining center, dynamic optimization design is done for the bearing support system and the structure of the spindle.