Abstract: Taking self-developed bainite bearing steel as research object, the single pass hot compression tests were carried out with thermal simulator at deformation temperatures of 900-1 200 ℃ and strain rates of 0.01-5 s^-1, and the hot compression deformation behavior of the steel was studied. The constitutive equation was established based on true stress and true strain data, and hot processing map was drawn. The results show that when the deformation temperature was not lower than 1 000 ℃ and the strain rate was below 0.1 s^-1, the dynamic recrystallization of the test steel during hot compression deformation was obvious. At the same strain rate, the higher the deformation temperature, the smaller the peak stress and the true strain at the peak stress; at the same deformation temperature, the greater the strain rate, the greater the peak stress and the true strain at the peak stress. The deformation activation energy of the test steel was 479.119 kJ·mol^-1 and was significantly higher than that of the traditional GCr15 martensitic bearing steel, indicating that the test steel was more difficult to deform at the same deformation temperature. The suitable hot processing range of the test steel was deformation temperature of 900-1 100 ℃ and strain rate of 1.4-2 s^-1.