Abstract: The effects of normalizing cooling rates on the microstructure evolution and mechanical properties of 0.92Mn-1.56Si-1.02Cr bainitic steel were studied by air cooling, air patenting and spray cooling. The results show that the microstructure obtained at three cooling rates is bainite and martensite multiphase microstructure.With the increase of cooling rate, the microstructure is refined and the average thickness of bainite lath decreases by 31%.The content of bainite decreases and the content of martensite increases.After 0.44 ℃/s air cooling, the content of bainite decreases to 52.3%, and after 1.48 ℃/s spray cooling, the content of bainite decreases to 17.2%. The hardness and strength of bainitic steel are improved, but the plasticity and toughness are decreased, and the fracture mode changes from ductile fracture to brittle fracture. The bainite content of the test steel is 46.8%when the average cooling rate is 0.91 ℃/s in the bainite transition zone during normalizing cooling, and the comprehensive mechanical properties of 0.92Mn-1.56Si-1.02Cr bainite steel are the best.