xBiYbO3-0.95(K0.5Na0.5)NbO3-0.05LiSbO3(x=0～0.002) (xBY-KNN-LS) lead free piezoelectric ceramics with BiYbO3 addition were prepared by the conventional ceramic sintering processing. The effects of BiYbO3 addition on the phase structure, microstructure and electrical properties of the ceramics were studied. SEM result showed that with the increase of BiYbO3 doped content, the grain size of xBY-KNN-LS ceramic decreased significantly, the Curie point drifted gradually to the low temperature, the piezoelectric property increased first and then reduced and the dielectric loss tan increased first and then reduced. There existed a near morphotropic phase boundary co existed with the orthorhombic and tetragonal phases in the range of 0≤x≤0.001 5. Whenx is equal to 0.1%, the ceramics have the optimal electrical properties with d33equal to 245 pC/N,kp equal to 44.75%,TC equal to 365 ℃ and tan equal to 4.5%.