Here,　we　show　the　large　electrocaloric　effect　near　room　temperature　in　ergodic　relaxor　(Bi1/2Na1/2)(0.93)Sa(0.07)　(Zn1/3Nb2/3)(0.01)Ti0.99O3　(BNBZN)　observed　by　a　modified　differential　scanning　calorimeter.　Microstructure　analysis　revealed　that　BNBZN　sample　demonstrates　global　pseudocubic　structure　with　locally　distorted　structures.　Electric　measurements　showed　that　the　sample　coexists　of　two　types　of　polar　nanoregions　(PNRs)　with　different　coupling　ability,　and　behaves　as　ergodic　relaxor　near　room　temperature.　Due　to　the　transition　between　two　types　of　PNRs　around　40　degrees　C,　large　adiabatic　temperature　change　of　1.04　degrees　C　with　high　electrocaloric　strength　of　2.1　x　10(-7)　degrees　C.m/V　was　recorded,　indicating　its　promising　prospect　for　solid-state　refrigeration　application.　(C)　2019　Acta　Materialia　Inc.　Published　by　Elsevier　Ltd.　All　rights　reserved.