Abstract: Aiming at the whole process of hot rolling of 960QT steel for high strength construction machinery, the experiments of high temperature oxidation kinetics, hot deformation and structural transformation of oxide sheet were designed. The evolution law of high temperature oxidation behavior of target steel in hot rolling process was systematically studied. The results show that the Cr content of 960QT is selectively oxidized after high temperature oxidation, which increases the oxidation activation energy, and the oxidation activation energy is 168.96 kJ/mol. The plasticity of the oxide sheet increases with the increase of rolling temperature, and the oxide scale has good deformation ability under high temperature, and the integrity of the oxide scale after rolling deformation is better. According to the structural transformation experiment of the oxide scale, it is found that FeO in the oxide scale undergoes two stages: the first eutectoid Fe₃O₄ precipitation and the formation of eutectoid structure. The TTT curve of the structural transformation of the oxide sheet was systematically drawn. It is found that the structural transformation process conforms to the C-type law, and the temperature of the nose tip of the eutectoid transformation is about 450 ℃. Combined with the above experimental results, the whole process of hot rolling is optimized, and the surface state of 960QT is obviously improved.