Modified CCT diagram of carbide free bainite-martensite（CFB/M）high strength steel was established applying small sample control cooling. In addition, the influence of thermomechanical treatment temperature on its structure and properties was discussed. The experimental results show that when deformed at 860oC and below, ferrite transformation occurred due to strain, and with the decrease of ausforming temperature, the quantity of ferrite increased and strength and toughness deteriorate. Therefore, certain information were provided for drawing technical parameter of ausforming process; firstly, the thermomechanical treatment temperature shouldn’t be above 860oC to avoid ferrite formation induced by deformation; secondly, cooling rate shouldn’t be too slow to avoid ferrite precipitating during cooling process after ausforming process.
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