The layer of parallel isolation structure is combined with sliding isolated bearings and rubber bearings. With the rubber bearings and the sliding isolation bearings learning from other’s strong points to offset their weakness

the parallel isolation structure is an economic system. Because the vertical stiffness of two kinds of bearings in parallel isolation structure is different

their axial forces will shift each other when the displacement of isolation layer increases under earthquake. The transfer is a self-adjustable performance of the system

and this redistribution of axial forces is favorable to the whole system. And can make the system change its energy dissipation capacity. A according to reasonable hypothesis

the axial forces-displacement behavior of the sliding isolated bearings is deduced and the shape of their relation curve is papilionaceous

when the transfer force is considered.