Continuous heating tests of without addition and addition rare earth 30Mn steel were investigated by using differential scanning calorimetry (DSC). The transformation activation energy and kinetic factor were obtained by Kissinger and JMA equation. The results show that the values of the starting temperature Ac₁ and the end temperature Ac₃are raised with rare earth addition. The activation energy can be increased by 186 kJ/mol, and the value of kinetic factor n is decreased. The austenitic transformation process of without addition and addition rare earth 30Mn steel have been described as two stages, and different stages have different grain growth mechanism.