Abstract: In an application of a traction motor for high power electric vehicle, it is needed to be designed with small size, light weight and low temperature rise. In the study, the design method of an induction motor satisfying improved performance is proposed by using design parameters of stator yoke. First in order for small size and light weight, a parameter related to cutting edge without magnetic saturation is suggested. Second in order for low temperature rise, a parameter related to ventilation hole in stator yoke is suggested. The characteristics are analyzed by using FEM according to motor speed within driving region which is divided into constant torque region and constant power region (field weakening control region).