This study focuses on the development of rotor of Permanent Magnet Assisted Synchronous Reluctance Motor (PMaSynRM). The target is to reduce the cost of the rotor magnet by using hybrid magnet including expensive NdFeB magnet and cheap ferrite magnet and the advantage of high-reluctant-torque PMaSynRM. Combined the method of optimization, the study develops the optimal motor having 150Nm. It reduces 24% of the magnet volume and 15% of the cost of magnet compare to the original motor.