In-wheel motor has the remarkable advantage and characteristic of highly integrating the powertrain, transmission and brake system, which can save the clutch, gearbox, transmission shaft, differential, transfer case, etc., so as to reduce weight, improve efficiency, simplify chassis structure, and increase vehicle interior available space. However, there are still many bottlenecks to be solved in the way of in-wheel motor industrialization. Combined with the brief analysis of the related technical, cost, manufacturing, marketing and other difficulties of in-wheel motor, the development of the in-wheel motor industrialization is searched and discussed.