The　particles　of　Fe3N　and　Fe4N　were　synthesized　by　the　solid-gas　reaction　method.　The　effects　of　process　parameters　on　the　products　such　as　the　ratio　of　NH3/H2,　the　reaction　temperature　and　the　holding　time　of　reaction　temperature　were　investigated.　The　pure　Fe3N　and　Fe4N　compounds　in　particle　form　were　obtained　basing　on　the　investigation.　The　permeability　and　permittivity　of　Fe3N　and　Fe4N　were　measured　by　vector　network　analyzer.　Comparison　results　show　that　when　the　frequency　ranges　from　1MHz　to　1GHz,　the　permeability　of　Fe3N　and　Fe4N　is　lower　than　that　of　ferrite,　but　the　permittivity　is　higher　than　that　of　ferrite,　and　the　electromagnetic　characteristics　of　Fe4N　are　better　than　that　of　Fe3N.