Abstract: In order to use SMA to control the seismic response of structure,SMA damper was optimal designed in this paper,and calculation model for the ferfex fixing organization was introduced.The damping effects of 9-floor steel frame structure with forfex-type SMA damper under normal and uncommon earthquake were simulated and analyzed;the affect of angle parameter on damper performances was discussed.Analyze results indicated that the forfex-type SMA damper has favorable damping effect,and can meet the seismic design specification for different structures by adjusting properly angle parameter.