The bearings of downhole power drilling tool, being one of the key components of drilling tools, bear the impact, friction, corrosion and other harsh working conditions, the reliability and longevity are essential to ensure the smooth drilling. In this paper, the frequently-used thrust bearing and the stabilizing bearing of the downhole drilling tools are studied in detail; the deep analysis on the development status, main characteristics and development trend of metal rolling bearing, sliding thrust bearing and stabilizing bearing are carried out respectively and the development and improvement direction of bearings for downhole power are pointed out, which can be used as reference.