A new lead-free BNT-based piezoelectric ceramics of (1-x)Bi0.5Na0.5TiO3-xBi(Al0.5Ga0.5)O-3 (x=0, 0.02, 0.03, 0.04, and 0.05) were synthesized using a conventional ceramic fabrication method. Their structures and electrical properties were investigated. All the samples show a typical ferroelectric P(E) loops and S(E) curves at room temperature. The optimal properties are obtained at the composition of the x=0.03. The substitution of Bi(Al0.5Ga0.5)O-3 enhances piezoelectric constant and increases Curie temperature from 58pC/N and 310 degrees C of pure BNT to 93pC/N and 325 degrees C of the x=0.03. The temperature-dependent P(E) loops and S(E) curves of 0.97BNT-0.03BAG indicate that phase transition from ferroelectric to antiferroelectric takes place over a very wide temperature region from 80 degrees C to 180 degrees C. The results show that the introduction of BAG improves the electrical properties of BNT.