(Na0.5Bi0.5)(0.93)Ba0.07Ti1-x(Mn1/3Nb2/3)(x)O-3　ceramics　(x=0-0.02)　were　prepared,　and　their　structure　and　property　were　investigated　systematically.　(Mn1/3Nb2/3)(4+)　doping　shifts　ferroelectric-relaxor　transition　temperature　(TF-R)　toward　low　temperature.　Thus,　ferroelectric　order　is　suppressed　and　relaxor　behavior　is　enhanced　monotonously,　as　further　evidenced　by　composition-dependent　electrical　properties　and　domain　evolution　from　labyrinthian　to　nanodomain.　As　a　result,　the　x=0.010　ceramic　yields　a　large　room　temperature　field-induced　strain　of　0.37%,　especially　the　strain　is　temperature-　and　frequency-insensitive　with　a　variety　of　4.3%　and　4.1%　in　the　ranges　of　25-125　degrees　C　and　0.5-10Hz,　respectively.　This　work　suggests　that　the　low　content　(Mn1/3Nb2/3)(4+)　complex　cation　doping　is　an　alternative　method　to　effectively　tune　the　electrical　properties　of　Na0.5Bi0.5TiO3-based　ferroelectrics.