Plasmid Extraction Mini Kit uses alkaline lysis method to lyse cells, and specifically extract plasmid DNA based on the principle that the centrifugal adsorption column specifically binds to the DNA in the solution under high salt conditions. The silicon matrix material used in the centrifugal adsorption column can adsorb DNA efficiently and specifically, and can remove impurity proteins and other organic compounds in cells to the greatest extent. The plasmid DNA extracted by this kit can be applied to various routine operations, including enzyme digestion, PCR, sequencing, ligation and transformation tests.