Abstract:Three IR-based methods were introduced to the identification of the moutai liquor and the fake. Ob－ vious differences between their 1-D spectra could be found， especially the characteristic absorption peaks of esters at 1 730 cm-1 as well as carboxylic peaks at 1 592 cm-1 around 1 200 cm-1-1 800 cm-1. Secondary deriva－ tive IR spectra also revealed the positional and intensive differences of the absorption peaks of ester and car－ boxylates. What's more， two-dimensional correlation IR spectra， which could identify moutai liquor and the fake by casting temperature disturbance on the samples， confirmed the results of 1-D and secondary derivative IR spectra and displayed the characteristic as its facility operating， brief graphics and considerable visibility.