In　IoT,　numerous　group　of　mobile　nodes　need　to　be　located　simultaneously,　for　instance,　robots　in　industrial　environment,　military　drill　and　tourism　and　the　like.　To　address　the　issue　mentioned　above,　a　novel　method　of　group　-　positioning　was　proposed,　group　partition　algorithm　and　RSSI　filter　algorithm　were　designed　and　implemented.　The　algorithm　was　verified　under　the　simulation　of　the　group　partition　algorithm　by　MATLAB.　In　addition,　in　order　to　implement　the　algorithm,　experimental　wireless　sensor　network　environment　was　constructed　with　the　use　of　Micaz　nodes.　Experimental　results　showed　that　this　method　could　reduce　positioning　time　and　extend　network　lifetime　on　the　premise　of　high　positioning　accuracy.