When you see the word “knife”, people may think of surgery, and for patients, in their own body to move the knife, the heart of the fear is obvious, this is also a normal human reaction. However, the gamma knife introduced here is in fact not a real scalpel, to be precise, the scientific name of the gamma knife is called gamma stereotactic radiation therapy system, is stereotactic radiotherapy, more accurate than ordinary radiotherapy. It will be 18 beams of gamma rays through the collimator and then focused around the tumor lesion, forming a high dose field of excellent quality, and will mash the tumor tissue in order to achieve the purpose of surgical removal. In other words, the treatment system replaces the surgical scalpel with gamma rays. Gamma knife treatment has a number of advantages compared to surgery, such as non-invasive pain, no bleeding, no special pre-surgical preparation and medication, and the treatment is carried out under awake and painless conditions. The treatment process is not affected by coexisting diseases such as age, heart disease, diabetes, hypertension and physical condition. It is especially suitable for tumors that are difficult to be removed by conventional surgery, or for those who are physically weak and cannot tolerate surgery, or for refractory tumors that are not well treated by other methods. The whole treatment process is controlled by computer, which has the characteristics of high precision, high efficacy and low damage. Multiple lesions can be treated at the same time at one time, or repeatedly. Gamma knife is a typical representative of stereotactic radiosurgery, which is a new technology to destroy and kill various tumor lesions. General radiotherapy severely damage the normal tissue of the disease. Gamma knife radiotherapy treatment is computer-controlled, precise, safe and reliable, with precise efficacy and no damage to normal tissues. Treatment is simple, time-saving, about a few minutes to a few minutes, no blood transfusion, medication, no diet and activity restrictions, patients generally do not need to be hospitalized. Gamma knife treatment process each time it takes about 10-20 minutes, each course of treatment about 6-10 times, once a day, the general patient hospitalization time is short, some do not need to be hospitalized, can save a lot of hospital expenses. All in all, Gamma Knife has its unique advantages over surgical treatment of tumors.