The　effect　of　discharge　voltage,　discharge　capacitance　and　riveting　time　on　rivet　deformation　degree　were　investigated　by　experimental　method　from　macro　and　micro　aspects.　The　results　show　that　the　rivet　deformation　degree　increases　with　the　increase　of　the　discharge　voltage　and　riveting　time　at　the　same　discharge　capacitance,　and　the　rivet　deformation　degree　increases　with　the　increase　of　discharge　capacitance　at　the　same　discharge　energy.　With　the　increase　of　rivet　deformation　degree,　the　radial　flow　of　the　material　increases,　the　deformation　degree　in　the　shear　zone　increases　remarkably　and　the　primary　shear　band　becomes　more　obvious.　The　grains　in　the　shear　zone　elongate　severely　and　distribute　along　shear　band　direction,　but　the　grains　at　both　sides　of　shear　band　have　little　changes.