Some benign tumors are sensitive to radiation, such as cavernous hemangioma. The liver is a good site for cavernous hemangioma. Because cavernous hemangiomas are benign and slow-growing, they do not affect the body much. For this reason, most of them do not have obvious symptoms and do not attract the patient’s attention. If the tumor is large, it may cause significant discomfort in the liver area, and most patients have a certain amount of mental burden after detection of the disease. Therefore, patients with larger tumors and significant symptoms or psychological burden should be treated aggressively. Currently, there are many treatment options for hepatic cavernous hemangioma, such as surgery and interventional therapy, the effectiveness of which has long been proven. However, both surgical and interventional treatments can be invasive and many patients are reluctant to accept them. Radiation therapy can cause endothelial cell damage and increased permeability of the vessel wall, and the leakage of proteins and other components from the blood can lead to local fibrosis and tumor shrinkage. Radiation therapy is an effective treatment for patients with contraindications to surgery and those who refuse surgery for hepatic cavernous hemangioma. It is also popular among patients because it is a safe and painless treatment. However, radiotherapy for hepatic cavernous hemangioma has been controversial because of the long-term survival of the patient considering that cavernous hemangioma is a benign tumor and taking into account the late side effects of radiotherapy. Hepatic cavernous hemangioma is a benign tumor that is sensitive to radiotherapy. However, it cannot be denied that over-irradiation can cause some damage to normal tissues. Therefore, the dose of radiotherapy for hepatic cavernous hemangioma should not be too high. From the literature and our observation, 30-35Gy can achieve the treatment purpose, that is, the tumor disappears, and it is very safe. With the development of radiation therapy equipment and technology, especially the application of three-dimensional conformal and intensity-modulated radiotherapy has certain advantages for radiotherapy of liver tumors. Three-dimensional conformal and intensity-modulated radiotherapy can precisely locate and evenly distribute the irradiation dose, which can well protect the normal liver tissues and adjacent important organs, and can reduce the radiation reaction and other complications of patients.