The principle of analyzing methane in air by Fourier transform infrared spectro scopy and cavity ring-down spec-troscopy is described.The linearity,precision and accuracy of the two methods are investigated,the linear correlation coeffi-cients of the two methods for the determination of methane in the air were greater than 0.999 99,and the relative standard de-viation were less than0.01%～0.05%,which satisfied the quality control require ments.The comparison and analysis of ac-tual samples show that there is no significant difference between the results of the two methods,and the two methods have good comparability.
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