IE5, published by International Electrotechnical Commission (IEC) in 2016, is currently the highest energy efficiency of motor in the world. The development of IE5 energy efficiency three-phase asynchronous motor is carried out. For the motor design, we consider to use high-quality cold rolled silicon steel sheet, try different fan structural styles and windings with unequal turns, and use cast copper rotor in low power motors, so as to lower the motor loss. For the process technology, measures to improve the machining accuracy and reduce burrs during stator and rotor punching are applied, so that the no-load loss of the motor can be further reduced. Prototype test results show that the indices including efficiency, power factor, starting current, starting torque, maximum torque and temperature rise all meet the design requirements. The goal of IE5 energy efficiency is achieved.