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.