Abstract: Rolling bearings are an important component to ensure the normal functioning of AC motors. Compared with traditional bearing fault diagnosis approaches, motor current and speed signature analysis has the advantages of non-intrusive and sharing signals with the control system, so it is gradually being applied in the field of the AC motor bearing fault diagnosis. In this survey paper, the important technologies and cutting-edge research results in the fields of theoretical model and fault diagnosis were summarized. For fault diagnosis, this paper mainly introduced the bearing fault diagnosis approaches using motor current signature analysis and motor speed signature analysis. At the same time, the advantages and disadvantages of these two bearing fault diagnosis techniques were pointed out. At last, the problems and challenges in present studies were discussed, and the future research directions are prospected.