Abstract: Gleeble-3500 thermal simulation testing machine was used to simulate the two-pass rolling of GCr15 bearing steel. The effects of different final rolling temperatures in 720-900℃ on the microstructure and hardness of GCr15 bearing steel were studied by microstructure observation and hardness test. The results show that the carbide in GCr15 steel rolled at finish rolling temperature of 720℃ is granular and the carbide in GCr15 steel rolled at finial rolling temperature of 900 ℃ is long strip. With the increase of finish rolling temperature, the continuity of carbide in the test steel is enhanced and the hardness of the test steel decreases. The carbides in GCr15 steel after final rolling temperature of 720 and 780℃ are intermittent and broken, which is beneficial to the dissolution of carbides during subsequent annealing.