Abstract: There are certain limitations in present column chromatography for the group compositional analysis of extract.In order to get it improved, a new method which combines Thin Layer Chromatography(TLC)with hydrogen Flame Ionization Detector(FID)was adopted.TLC sintered bar is coated with silica gel or alumina as absorbent. After repeated chromatographic developments, the bar moves through flame detector at a constant rate, and each component is automatcally scanned. This method is quick,precise and especially applicable to the analysis of carbonate rock sample with low extract content. Furthermore, because TLC bar has been burnt on hydrogen flame, the absorbent is reactivated, so that it needn't to be recoated. The sintered bar can be repeatedly used for about 50-100 times.