Pushover　analysis　of　a　three-story　one-span　space　frame　under　oblique　seismic　action　was　conducted　using　ABAQUS　software.　The　loading　angle　is　0　degrees,　15　degrees,　30　degrees　and　45　degrees　respectively.　Failure　mechanism　of　the　space　frame　was　analyzed,　such　as　yield　sequence　of　beam　end　and　column　end,　and　force-displacement　curves.　The　results　indicate　that　the　structure　loaded　with　angle　of　0　degrees　failed　when　beam　hinge　appeared.　With　the　increasing　of　load　angle,　the　failure　mechanism　of　frame　changed　from　beam　hinge　failure　to　column　hinge　failure　gradually.