A gas chromatographic method was used for the analysis of nonvolatile organic acid in fruit wines. Plum wine (Ume shu in Japanese), cherry wine and plum wine were prepared by the conventional method in this study. Nonvolatile organic acids in the wines were separated by ion exchange chromatography. Analysis of the acids from butylation by gas chromatography (GC-Mass) led to detection and identification of some acids not reported hitherto. They were levulic acid and an acid having molecular weight of 121. These two acids are the products of decomposition of sugar by butylation of samples.