Abstract: The simplified analysis of the parallel composite isolation system was carried out based on equivalent linearization method． First of all，through the derivation，the restoring force model expressed in the form of basal shear force and displacement was converted to the basal shear force coefficient and displacement model; then， according to the new code for seismic design of buildings，the application of the simplified analysis method was explained． Finally，combined with the results of the basal shear coefficient and the displacement，the seismic isolation performance of the parallel composite isolation system was analyzed，focusing on the effects of different stiffness coefficients，friction bearing ratios and site characteristic periods． The results showed that the simplified analysis method could be conveniently and effectively used for preliminary design of the parallel composite isolation system，which laid a foundation for the popularization and application of the parallel composite isolation system．