The　magnetic　and　magnetocaloric　effects　of　manganites　of　Pr0.5Sr0.5-xCexMnO3　(x　=　0,　0.04,　0.08　and　0.1)　prepared　by　standard　solid-state　reaction　method　are　investigated.　Large　magnetic　entropy　changes　(Delta　S-m)　with　the　ferromagnetic-paramagnetic　transition　have　been　found.　The　Delta　S-m　and　Curie　temperature　(T-C)　gradually　increase　with　increasing　Ce　content.　The　maximum　of　magnetic　entropy　change　in　a　low　magnetic　change　of　15　kOe　is　about　-1.93　J　kg(-1)　K-1　for　x　=　0.1　sample　with　a　T-C　value　of　310K.　Due　to　the　large　Delta　S-m　and　tunable　T-C　around　the　room　temperature,　it　is　suggested　that　Pr0.5Sr0.5-xCexMnO3　could　be　used　as　desirable　active　room　temperature　magnetic　refrigerants.