Big　data　is　an　up-to-date　attractive　research　topic　and　also　full　of　challenges.　Sharing　massive　sensitive　personal　data　in　public　cloud　will　arouse　large-scale　privacy　concerns.　Data　encryption　is　a　widely　accepted　way　to　prevent　information　leakage.　However,　it　is　difficult　for　the　users　to　retrieve　desired　information　from　encrypted　big　data.　In　this　paper,　we　provide　a　novel　keyword　search　method　to　enable　customers　easily　searching　keywords　from　encryption-protection　data.　Moreover,　the　encrypted　big　data　could　be　managed　by　different　type　that　was　assigned　by　data　owner.　Moreover,　the　access　right　can　be　delegated　to　others　according　to　the　user＇s　willingness.　Security　and　efficiency　analysis　are　provided　to　prove　the　security　and　efficiency　of　the　scheme.　©　2014　IEEE.