With　the　advantage　of　small　volume,　low　power　consumption,　quickly　switch,　and　high　stability,　the　micro-electro-mechanical　relay　may　bridge　the　performance　and　economic　gaps　between　conventional　electromagnetic　relay　and　solid　state　relay.　Analysis　of　three-dimensional　magnetic　field　is　the　foundation　work　for　optimum　design　of　electromagnetic　system.　The　magnetic　distribution　character　of　micro-electro-mechanical　relay　was　analyzed　by　applying　Biot-Savart　law　and　integral　equation　method　(IEM).　The　results　of　IEM　and　FEM　show　the　method　which　used　in　analyzing　three-dimensional　stationary　magnetic　field　for　Micro-electro-mechanical　relay　is　feasible.　The　revised　schemes　were　designed　basing　on　the　original　model　features,　and　central　planer　coil　structure　was　preferable　by　analyzing　electromagnetic　attraction　force　of　movable　contact.　The　optimum　design　was　realized　associated　with　the　relationship　among　coil　turns,　exciting　current　and　electromagnetic　attraction　force.　The　conclusions　are　valuable　in　theory　and　practice　to　design　Micro-electro-mechanical　relay.