Bulk　Sm2Fe17Nx　sintering　magnet　was　fabricated　by　spark　plasma　sintering(SPS)　technique.　The　effects　of　sintering　pressure　and　sintering　temperature　on　the　magnetic　properties　of　the　Sm2Fe17Nx　magnet　were　investigated.　As　a　result,　the　density　of　the　magnet　is　obviously　improved　with　the　increase　of　sintering　pressure,　but　the　coercivity　drops　since　Sm2Fe17Nx　has　decomposed　into　SmN,　alpha-Fe　and　N-2.　When　sintering　temperature　was　only　above　200　degrees　C　under　1　GPa　sintering　pressure,　the　coercivity　even　begins　to　decrease,　which　indicates　that　high　pressure　promotes　the　decomposition　of　the　Sm2Fe17Nx　at　lower　temperature.　The　decomposition　is　also　proved　by　the　decrease　of　nitrogen　and　increase　of　alpha-Fe　in　the　magnets.