In　this　paper,　a　novel　fall　detection　and　automatic　alarm　system　has　been　designed　and　presented,　which　consists　of　sensor　module,　control　module　and　communication　module.　The　sensor　modules　composed　of　3-axis　accelerometers　are　placed　on　object＇s　pocket　to　monitor　the　object＇s　acceleration.　System　is　driven　by　an　inexpensive　and　low　consumption　microcontroller.　When　object　is　fall,　the　system　will　detect　it　by　the　abnormal　acceleration　and　make　accurate　positioning　through　GPS　immediately.　The　alarm　as　well　as　location　information　is　sent　via　3G　network　to　the　mobile　phone　number　that　has　been　set.　The　system　has　the　advantages　of　portable,　low-power　and　accuracy.