"Tiny Cooling Fan" as a key part of the electronic device cooling system plays a vital role in ensuring stable and reliable system operation. According to statistics, most of the mechanical failure of the cooling fan focused on bearing failure. Therefore, the "Tiny Cooling Fan" Bearing conduct fault diagnosis and condition assessment can guarantee the reliability of electronic equipment operation and extend the life of electronic devices. Vibration mechanism and operation mode for cooling fan bearings and carries out a series of fault diagnosis and research status assessment, the main contents include: analysis of the "Tiny Cooling Fan" structural features, review the rolling bearing vibration mechanism and signal characteristics .