Malignant tumors seriously threaten human life and health. According to WHO, 7 million people die from cancer every year worldwide, one person dies every six seconds on average. In China, about 1.5 million people die from cancer every year. At present, it is becoming the main cause of human death other than cardiovascular disease. X-ray knife is a special radiotherapy technique developed in recent years. It is based on modern imaging diagnosis such as CT, MR, DSA, etc., and uses medical linear gas pedal as the irradiation source to irradiate the tumor target area with stereotactic non-coplanar multi-line beam to cause conformal necrosis of the tumor and to protect the surrounding normal tissues from damage to the maximum extent. If PET-CT (Positron Emission Tomography) is used, the metabolic activity and death of cells can be observed at the molecular level a few days after X-ray knife treatment, so that the treatment effect can be judged or supplemented in advance. It takes a month or longer to see the morphological changes of the tumor with CT, MR, BUS, etc. X-ray knife is a comprehensive fringe discipline that integrates the theories and technologies of modern diagnostic imaging, surgery, neuroscience, tumor radiotherapy, radiation physics, radiobiology, computer technology, and medical engineering. It is an efficient, precise, non-invasive, painless and non-invasive treatment method, which is a new technology of medical science in today’s trans-century. Our hospital currently has head X-ray knife, body X-ray knife, three-dimensional conformal, intensity-modulated conformal radiotherapy, and PET-CT image-guided precision radiotherapy technology in addition to conventional radiotherapy. Head x-ray knife can treat intracranial and skull base tumors, such as brain arteriovenous malformations, hemangioma, chordoma, brain stem tumors, thalamic tumors, pituitary tumors, pineal tumors, auditory neuroma, trigeminal neuroma, glioma, meningioma, brain metastases, and other functional brain diseases. Body x-ray knife and conformal intensity modulated radiotherapy can treat tumors in the neck, chest, abdomen and pelvis, such as: nasopharyngeal cancer, laryngeal cancer, thyroid cancer, cervical lymph node metastases, lung cancer, esophageal cancer, thoracic cancer, mediastinal tumors and mediastinal lymph node metastases, primary liver cancer, liver metastases, hepatic hemangioma, pancreatic cancer, bile duct cancer, retroperitoneal tumors and peritoneal lymph node metastases, prostate cancer, bladder cancer, rectal cancer, uterine cancer, uterine cancer, and other tumors, rectal cancer, uterine cancer, ovarian cancer, pelvic lymph node metastasis, etc. X-ray knife has many advantages: ①no incision, no anesthesia, no pain; ②safe, effective, reliable and easy; ③no bleeding, important structural damage and serious complications caused by conventional surgery; ④applicable to patients with early or middle to late stage tumors and patients with inoperable lymph node metastases. ⑤Patients who are too old and weak to tolerate surgery or unwilling to operate; ⑥Patients with tumor recurrence or partial residual foci after surgery.