Distribution　of　magnetic　flux　density　and　magnetic　force　in　electromagnetic　riveting　was　investigated　with　the　electromagnetic　field　coupling　model　established　by　the　finite　element　method.　The　results　show　the　radial　magnetic　flux　density　presents　a　sinusoidal　exponential　decaying　form　at　a　point　and　the　maximum　value　of　radial　magnetic　flux　density　lies　in　about　half　of　the　driver　plate　radius　along　the　driver　plate　radius　direction.　The　distribution　of　magnetic　force　is　determined　by　that　of　magnetic　flux　density　and　the　magnetic　force　is　a　body　force,　which　weakens　very　quickly　from　the　inside　to　the　outside　of　the　driver　plate.　In　order　to　prevent　penetration　of　magnetic　field,　the　thickness　of　driver　plate　is　an　important　parameter　to　increase　the　energy　utilization　ratio.