The structure, micromorphology, and electrical properties of the xPb(Mg 1/3 Nb 2/3 )O 3 -(1-x)(0.3BiScO 3 /0.7PbTiO 3 ) (xPMN-BS-PT, x=0.34∼0.42) compositions close to the morphotropic phase boundary (MPB) have been systematically investigated as a function of PMN content (x). The phase approached from the rhombohedral toward the tetragonal phase when the PMN contents decreased. The composition with high PMN content exhibited a diffused phase transition characteristic while it showed normal ferroelectric behavior as PMN decreased. In the vicinity of the MPB, the composition (x=0.38) owned enhanced ferroelectric, piezoelectric, and electromechanical properties.