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The behavior of austenite grain growth and the solution of Ti were researched by heated in an electric furnace at the temperature of 850℃ to 1250℃ for 30 min.The precipitates of Ti during the heating process were examined by transmission electron microscopy(TEM).The results indicate that the tested steel has two grain coarsening temperatures of austenite grains with the increase of heating temperature,1050℃ and 1250℃ respectively,which corresponds to the solution temperature of two precipitates of Ti,but lower than the value of the solution temperature.It is found that the activation energy of grain growth reduced from 26,561 J/mol to 239.8 KJ/mol with the dissolving of TiC precipitates by analyzing two stages of austenite grain growth process.