This product is a premix composed of Super Kfx DNA Polymerase, Mg2+, dNTPs, PCR stabilizer and enhancer with a concentration of 2×. Super Kfx DNA Polymerase is a fast, high amplification efficiency and high-fidelity DNA polymerase, which has 5 '-3' DNA polymerase activity and 3 '-5' exonuclease activity, and has the advantages of strong amplification ability, high fidelity and strong specificity. The unique amplification enhancer and extension factor are added to 2×Mix, and the unique formula makes the whole reaction system very stable and easy to operate, which is suitable for the amplification of various fragments and templates. This product is suitable for amplification experiments such as gene cloning, NGS library amplification, gene site-specific mutation, SNP, etc.