Abstract: The kinetic equation of interfacial reaction in simulating C/Al composite materials is established based on the theoretical analysis of diffusion limited interfacial reaction and experimental measurement.A set of reaction diffusion equations was analytically solved,and Scanning Auger Microprobe Depth Profile was applied to mersure the thickness of interfacial reaction zone.The results of experimental measurement verified well the kinetic equation of interfacial reaction proposed here,and gave the activation energy of interfacial reaction for the present specimens.