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The thermal fatigue cracking behaviors of a chromium (Cr) coating/laser pre-quenched steel substrate system and a Crcoating/original steel substrate system were investigated in this work. The experiment results are: the crack density of Cr coating onthe pre-quenched substrate surface was much lower than that of the Cr coating on the original substrate surface under the samethermal fatigue loading; the Cr coating on the pre-quenched substrate surface exhibited a higher resistance of interfacial cracking anda higher resistance of cracking of the coating itself than those of the Cr coating on the original substrate surface. These experimentresults validate the technology of laser pre-quenching of steel substrate surface prior to plating the Cr coating can improve not onlythe interfacial adhesion properties, but also the mechanical properties of the Cr coating itself.