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The effect of a small amount MnO2 doping on the piezoelectric and ferroelectric properties of (Bi0.5Na0.5)0.9Ba0.07Sr0.03TiO3 (BNBST) Lead-free ceramics prepared by the conventional mixed oxide method was systematically investigated.At x=0.25,the MnO2-modified BNBST ceramics exhibit optimal piezoelectric and dielectric properties (d33=157pC/N,kp=33％,Qm=364,tanδ=2％,εr=843) and excellent ferroelectric properties composed by a higher remanent polarization Pr (Pr=25.9μC/cm2) and lower coercive field Ec (Ec=2.54kV/mm) at room temperature.Moreover,the two characteristic dielectric peaks can be observed in this ceramics.