Unzymic Biluochun tea,zymic Pu-er tea,and half-zymic Oolong tea,were distinguished by Fourier transform infrared spectroscopy. Although they′re similar in infrared spectrum,the results still show differences in the characteristic peaks of infrared spectrum caused by difference between three kinds of teas of different zymic degree.The results show that zymic degrees of teas tie up with variety of absorbance band at about 1037,1147,1324,1520 and 1240 cm . According to the studies of the spectral peaks and absorbance rations,unzymic,half-zymic and zymic teas can be easily identified.