As a main member of gantry machining center, transversal feed system’ static and dynamic characteristics directly affect the performance of gantry machining center. Its structure determines the static and dynamic characteristics of the system, so it is necessary to optimize the structure of the system. Finite element software ANSYS was used to analyze the static and dynamic characteristics of the transversal feed system. Influences of installation position of single screw, the usage of single or double-screw and double-screw span on the transversal feed system were analyzed.The simulation results show that the transversal feed system has the best static and dynamic characteristics when single-screw mounting on the cross slide mass center; double screw with two points support has stronger anti-overturning moment ability than single-screw with one point support; double screw system frequency is 18.9% higher than single-screw system when torsion mode shape is appeared; with the increasing of screw span, anti overturning moment ability of the system is improved and the system frequency is increased up to 36.3%.