The tension of the isolation rubber bearing is a very important control parameter for the design of the isolation layer of the isolation structure. In this paper, the parallel connection of Isolator1 unit and Gap unit in the etabs2013 analysis software is used to simulate the isolation rubber bearing, so as to reflect the vertical mechanical properties of the isolation rubber bearing more truly. In this study, the stiffness of Isolator1 element and Gap element are allocated according to the tensile and compressive stiffness of the support through a practical engineering model. The analysis data show that the tensile stress of Isolator1 element of the new model is significantly reduced, while other horizontal performance indexes remain unchanged. The results show that the method can be applied to the time-history analysis of isolated structures. It provides a valuable reference for practical engineering analysis.