SBRT, stereotactic radiation therapy, is one of the advanced radiation therapy means nowadays, with high biological effect, so the treatment effect is very good, it is a high dose irradiation for the purpose of radical tumor treatment under image guidance, generally the number of treatment does not exceed 5 times, it is a precision radiation therapy technique, it may have to use special positioning method, image guidance, stereotactic radiation therapy technique to realize the control of the target area The precise positioning and placement of the target area, while allowing the high dose in the target area to focus on the tumor, and the peripheral dose falls down rapidly, similar to surgery. Therefore, for inoperable early stage non-small cell lung cancer, the local control rate can reach 90% with stereotactic radiation therapy, the three-year survival rate can reach about 43%-83%, and the five-year survival rate reaches 50%, and the 2-year local control rate of brain metastases with stereotactic radiation therapy is about 70%-90%, and the overall survival rate can reach 40%-66%. For breast cancer metastases treated with stereotactic radiation therapy for 4 years, the lesion progression-free period, survival, and overall survival can reach 89%, 38%, and 59%, respectively, and the 20-year overall survival can even reach 53%. Therefore, stereotactic radiation therapy has a relatively high biological effect and can also change the tumor microenvironment, which is now one of the most advanced treatment methods.