The development process of China′s threephase asynchronous motor were discussed, the main representative products were JO, JO2, Y, Y2, Y3, YX3, YE2, YE3 series threephase asynchronous motor. The international standard of threephase asynchronous motor series products since 1978 were introduced, and Equivalent to the adoption of international standard IEC6003430 in recent years and combined with the actual situation of small and medium motor products in China, the energy efficiency classification of threephase asynchronous motors was analyzed.