Microstructure　and　electrical　properties　of　manganese　oxide　(MnO)-doped　(Na0.5Bi0.5)(0.92)Ba0.08TiO3　(NBBT)　piezoceramics　were　investigated　in　this　work.　X-ray　diffraction　analysis　shows　that　the　suitable　substitution　of　Mn　ion　into　the　B　site　induces　the　lattice　distortion　of　perovskite　NBBT:　the　solution　limit　is　at　0.3　wt%　MnO.　Besides,　it　is　observed　that　the　sintering　properties　can　be　improved　by　adding　a　small　amount　of　MnO,　thus　increasing　the　grain　size　and　the　relative　density.　Further,　the　temperature　dependence　of　the　dielectric　permittivity　of　NBBT　ceramics　indicates　that　the　MnO　addition　reconstructs　the　disorder　array　destroyed　by　joining　BaTiO3　in　the　Na0.5Bi0.5TiO3　system　due　to　the　sizable　radius　of　the　B-site　cations.　Combining　these　effects　of　MnO　addition,　the　optimal　electrical　properties　were　acquired　for　NBBT　ceramic　with　addition　of　0.30　wt%　MnO.　The　excellent　electrical　properties　of　MnO-doped　NBBT　ceramics　indicate　its　promising　application　in　large　displacement　actuators.