This paper summarized that the pure products of thea saponin could be obtained by using the method of thin layer chromatography.The quantitation of thea saponin in product was raised to 92.7% by using the method of quantitative determination in which the 8.0% vanilinalcohol solution and 77% sulfuric acid were used as colour reagents.The wave length was measured to be 550 nm,the colour reaction temperature was 60 ℃ and the reaction time is 15 minutes.This method was better than othe...