PCR instrument is a core equipment in biology teaching and molecular biology research, which is used for rapid amplification of specific DNA fragments in vitro. The PCR instrument achieves three steps of DNA denaturation, annealing, and elongation by precisely controlling the temperature cycle, thereby obtaining a large amount of target DNA in a short period of time. In biology teaching, PCR machines allow students to personally operate molecular biology experiments and understand the principles and processes of gene amplification. Through PCR experiments, students can learn about the molecular structure of DNA, gene cloning techniques, and diagnostic methods for genetic diseases. PCR instrument is a very important tool in biological experimental teaching, which helps cultivate students' experimental skills and scientific thinking.