To　study　the　operation　characteristics　of　light　electric　vehicle,　the　paper　developed　a　battery　management　system　of　light　electric　vehicle.　The　system　mainly　contains　battery　protection　module,　battery　equalization　module,　battery　data　management　module.　It　could　be　real-time　monitoring　the　operation　parameters　of　batteries　effectively:　rotational　speed　of　motor,　State　of　Charge　(SOC)　of　the　batteries,　voltage　and　current　of　the　batteries,　temperature　of　the　feature　points　in　the　battery　package.　It　can　also　equal　the　voltage　inconsistency　between　different　batteries　and　realize　the　protection　and　alarm　functions　etc.　The　results　showed,　the　system　ran　stable,　reliable,　and　met　the　precision　requirements,　thereby　the　system　lays　a　foundation　for　the　engineering　application.　©　2011　IEEE.