Eleven kinds of vinegar samples manufactured in different regions of China were tested in this experiment.HPLC was used to analyze the contents of ten organic acids.Then,principal component analysis(PCA) was used to classify the eleven kinds of vinegar samples with ten organic acid contents as index.The results showed that the contents of lactic acid and acetic acid were the most highest and above 80% of the content of the total organic acids;the frontal 4 principal factors contained 87.022% information about organic acid contents in the eleven kinds of vinegar samples.The eleven kinds of vinegar samples could be divided into four groups by factor scores,which represented four different regions and reflected correctly the origins,processing and relevance of the samples.