Multi-point impulse tests, which could determine the transfer function of each point, were carried through on vertical and horizontal direction of sphericalguide-slider joint surface by DATRAN dynamic analyzer. Multi-point impulse tests could determine the transfer function of each point. In order to determine the single-DOF mode of the sphericalguide-slider joint surface, the top surface and one of the flanking surfaces of the sliding block were selected as test-object. When the amplitude of each point on the same surface is mainly equal with each other, the corresponding mode could be judged to be single-DOF mode. The experiment conclusion would be a foundation for the future dynamic simulation.