Abstract: Gleeble1500 thermal simulation machine was used to simulate the hot rolling process of GCr15 bearing steel with the aim to reasonably determine the cooling process after rolling, where the final-pass temperature was 830°C. The dynamic CCT curve was therefore given. Optical microscopy and SEM were employed to investigate the influence of cooling rate on the thickness of pearlite lamella and network carbide precipitation, and the results showed that the thickness of pearlite lamella thins with increasing cooling rate within a certain range of cooling rate, while a coarse pearlite-like structure takes place if the cooling rate is too high. When the cooling rate is about 10°C/s, the pearlite lamella structure is obtainable and the quantity of network carbide precipitation can be decreased efficiently.