This Kit uses an optimized buffer system and silica gel column purification technology to recover DNA fragments of 70 bp - 20 kb from TAE/TBE agarose gels of various concentrations, which can be sol transferred to a DNA adsorption column and directly centrifuged under high salt conditions to specifically adsorb DNA and remove other impurities. In addition, the kit can directly purify DNA fragments from PCR products, enzymatic reaction systems or crude DNA products obtained by other methods, and remove impurities such as proteins, other organic compounds, inorganic salt ions and oligonucleotide primers. It can ensure that the purification can be completed within 10 - 15 min. The purified DNA can be used directly for ligation, transformation, enzymatic digestion, in vitro transcription, PCR, sequencing, microinjection, and other molecular studies