Medical gases are gases that are used in medicine, not only for treatment, but also for anesthetics, clinical experiments, and bacterial culture. For argon, the current medical use is mainly high-frequency argon knife and argon helium knife. Both from the name, seems to be about the same use, in fact, the actual application is very different. The argon helium knife is a new type of application for the treatment of tumors, the principle of which is realized by the method of tissue cell freezing, which makes the internal structure of the tumor change qualitatively through the constant exchange of heat and cold, and splits the tumor body to achieve the therapeutic effect. Compared with radiotherapy, this method is simple and has few side effects, which can eliminate the pain that the patient suffers in the process of radiotherapy, and the effective rate reaches more than 90%.