Abstract: A method for evaluating the fingerprint chromatographs of a mixed system by Euclidean-Mahalanobis distance was put forward.The Euclidean-Mahalanobis distances of GC/MS fingerprint chromatographs of six standard samples and two mixture samples,and six standard samples and eight absolute alcohol-diluted samples were calculated by combining with principal component analysis.The results showed that the standard samples were well discriminated from mixture or diluted samples by their Euclidean-Mahalanobis distances.It suggested that EuclideanMahalanobis distance combining with principal component analysis could be used to recognize flavor fingerprint chromatographs.