Probing　a　lead-free　ferroelectric　with　a　large　electrocaloric　effect　(ECE)　and　excellent　temperature　stability　is　a　challenge　in　developing　solid-state　electrocaloric　refrigeration.　In　this　work,　we　constructed　0.93(Na1/2Bi1/2)TiO3-0.07[(1　-　x)BaTiO3-x(Nd-2/3　square(1/3))(Zn1/3Nb2/3)O-3]　(NZN100x)　lead-free　ferroelectric　ceramics　by　introducing　A-site　vacancies　and　B-site　complex　cations　simultaneously.　Direct　electrocaloric　measurement　shows　that,　for　x　=　0.14,　a　high　Delta　T　of　1.17　K　was　obtained　at　45　degrees　C　under　5　kV/mm;　meanwhile,　the　sample　x　=　0.20　gives　a　large　Delta　T　of　0.91　K　with　a　10%　variation　in　a　wide　temperature　span　(T-span)　from　40　to　80　degrees　C.　The　excellent　ECE　performance　opens　up　a　route　for　designing　lead-free　electrocaloric　materials　based　on　the　synergic　effect　of　composition　design　and　defect　engineering.