For high-quality sequencing data, accurate library quantitative analysis is very important. There are two main systems for quantification in NGS: qPCR based on real-time fluorescence quantification and Qubit quantitative method based on fluorescence spectrum. Yeasen provides NGS library quantitation kits for ssDNA and dsDNA based on Qubit quantitative method. The principle of Qubit is to use fluorescent dyes to bind to DNA molecules and then measure the fluorescence intensity to obtain the concentration of dsDNA.