Abstract: A new base isolation seismic method of vertical spring-steel rolling base isolation seismic system is proposed, the vibration equations of the base isolation seismic system are established according to the non-variation principle of potential energy and the rule of 'set-in-right-position'. The effect of every control parameter on the system response are analysed. The research results show that the structure of the isolated seismic system is simple and the effect of isolating the horizontal earthquake is optimal.

Key words: horizontal earthquake isolation, vertical spring-steel rolling base isolation system, ' set-in-right-po-sition 'rule