The application of infrared spectral on quality identification of tea is studied. The standard infrared spectra of special grade tieguanyin, special grade Longjing and fresh Pu′er typical tea are respectively measured by Fourier transform infrared spectrometer. By the visual analysis on the infrared spectra it is found that the infrared absorptions of several kinds of tea can all be divided to several big areas, furthermore the spectra are similar induced by the similar of primary contents of tea. So it is difficult to visual distinguish the different spectra. In order to emphasize the contrast of character parts, better display the discrepancy of different kinds of tea, in virtue of mathematical method and computer program the array relativity of spectra is analyzed. The results show that the correlation coefficients of several kinds of tea in the region of wavenumber 1130～1570 cm-1 which belongs to the fingerprint region are smaller than the whole and other regions of wavenumber that can effectively sign the component character of tea, that is the reflected fingerprint information in this region is more obvious, the small change of structure character is more easily judged. The three kinds of tea can be distinguished by this region of wavenumber.