Abstract: A high amorphous content Fe-based amorphous coating was prepared by the activated combustion high-velocity air-fuel (AC-HVAF) spraying method. According to the thermodynamic transformation theory of amorphous alloys, the crystallization of the fractional crystallized amorphous alloy is the transformation of residual amorphous phase, and its transformation enthalpy should be proportional to the phase content of residual amorphous phase. The coating was crystallized by different heat treatment methods. The nanocrystal content in the heated treating coatings and the fractional transformation enthalpy were measured by DSC analysis. The crystallization of the coating was detected. The experimental result basically matched with the data of theoretic forecasting.