Abstract: In order to explore the torsional resistance of double-layer isolation for irregular buildings under the influence of horizontal near fault ground motion, for a 12-story planar irregular structure model, considering the effects of different locations of middle-isolated seismic layer in the double-layer isolation system, three different double-layer isolation systems were modeled using SAP2000 finite element software, compared with the building foundation fixed model and the conventional base isolation model, two types of near-fault ground motion are input to the structure in both the X-direction and Y-direction and are simulated numerically to analyze various seismic performance related dynamic response parameters of the structure output. The results ae as follows. The use of three-layer seismic isolation system can increase the self-oscillation period of the structure by 1.8 times and the period ratio of the three-layer isolation system is even smaller. The three-layer isolation system has the smallest interlayer shear force, the three-layer isolation system can effectively reduce the elastic interstudy drift angle of the structure. The three-layer isolation system has better floor acceleration control capability for planar irregular structural floors than other models. The torsional displacement ratio of the double-layer isolation system is much smaller than that of the building foundation fixed model, its control of torsional displacement ratio in small span direction is more obvious. Three-layer isolation system has better seismic performance than other models, therefore attention should be paid to the parameter selection of the middle isolation layers in the design.