Cells are the basic unit of life structure and life activities.Because of the complex micro-environment of cells,the content of components that play a key role is relatively small,so single-cell analysis is extremely challenging.In recent years,single-cell sequencing technology has been developed and matured.Single-cell sequencing can reveal the composition and physiological diversity of cells,and the existing single-cell separation technology,single-cell whole genome amplification technology,single The principles and applications of cell whole transcriptome amplification technology and single cell transcriptome sequencing are summarized and summarized.