In order to accurately evaluate the dynamic and static characteristics of the structure of the heavy cutting gantry boring and milling machining center during the design phase,a finite element model was established for the entire structure of the machining center,and the static and dynamic characteristics as analyzed.The accuracy and effectiveness of the dynamic simulation model were verified through modal testing,and suggestions for structural optimization of the machining center were proposed based on the analysis results.The results show that the static stiffness in the Y direction of the machining center is low due to the insufficient static stiffness of the ram,under 1 500 N cutting force,the maximum deformation can reach 0.008 137 mm.The first six measured natural frequencies of the machining center are 41.87 Hz,55.69 Hz,88.06 Hz,103.45 Hz,129.68 Hz and 159.41 Hz,respectively.The average simulation calculation error of the first six natural frequencies is 6.5%.The positions of the columns and rams are prone to significant dynamic deformation response under external excitation forces.