Oblique　seismic　action　is　one　of　the　important　factors　that　affects　the　＇strong　beam　weak　column＇　(SBWC)　failure　principle　of　frame,　which　hasn＇t　been　considered　in　strong　column　coefficient　of　steel　frame　based　on　the　current　code　for　seismic　design　of　buildings.　In　this　paper,　mechanical　analysis　of　the　beam-column　joint　has　been　done,　the　result　indicated　that　SBWC　failure　mechanism　can　be　realized　if　strong　column　coefficient　under　oblique　seismic　action　is　greater　than　square　root　of　2.　Failure　mechanism　of　steel　frame　with　strong　column　coefficient　1.35　according　to　the　current　seismic　design　code　has　been　studied　through　shaking　table　test　and　finite　element　model　simulation.　The　final　results　demonstrated　that　the　same　frame,　when　the　input　is　axial,　the　prefect　realization　of　SBWC　failure　principle　can　be　observed,　however　when　the　input　is　oblique,　the　beam　destroyed　before　column.　That　means　oblique　seismic　input　has　significant　influence　on　the　failure　mechanism　of　steel　frame,　which　should　be　considered　in　seismic　design.　©　2016,　Science　Press.　All　right　reserved.