Carbohydrate is one of the important components of plant corpus, and is also the main raw material of metabolism and storage material. The kit is used for the determination of soluble monosaccharides, oligosaccharides and polysaccharides. It has the advantages of high sensitivity, quick convenience and suitable for the determination of microscale samples. The detection principle is anthrone colorimetry. Carbohydrate react with anthrone to produce colored material, which has the maximum absorption peak at 620 nm. The soluble sugar content can be determined by measuring the absorbance value.