Based on the three-tower suspension bridge,the effect of elastic cable parameters on anti-seismic performance are compared by using finite element method.In the longitudinal direction,elastic cables are set between the middle tower and the main girder to restrict the longitudinal relative displacement.Different parameters of elastic cables are employed to compare and analyze the bridge response results in terms of the internal forces of the tower bottom and displacement of the girder end.The analysis results showed that the reasonable stiffness of elastic cables can obviously decrease the displacement of girder end,the top displacement of towers and the relative displacement between the middle tower and main girder.Meanwhile,it also can decrease the internal forces of the side tower bottom,but slightly increase the internal forces of the middle tower bottom.Elastic cables are introduced mainly to provide structural system with elastic stiffness other than energy dissipation.Distribution inertial forces of the structural system are more reasonable by changing the transform path of inertia forces.