Liver cancer patients with small lesions in early stage may have their tumors disappeared after radiotherapy, while patients with large or scattered lesions in middle and late stage may not be able to eliminate the lesions completely with radiotherapy, but it can alleviate their symptoms. External radiation therapy for liver cancer often adopts stereotactic radiotherapy (SBRT), which is suitable for patients with CNLC stage Ia and part of stage Ib who have no indications for surgical resection or local ablation or are unwilling to undergo invasive treatment; patients with CNLC stage IIa, IIb and IIIa can be treated with chemotherapy by arterial embolization or targeted drugs combined with radiotherapy. For some patients with CNLC stage IIIb liver cancer with oligometastases, SBRT is feasible to prolong the survival time and reduce the symptoms of pain, obstruction or bleeding caused by metastases in lymph nodes, lungs, bones, brain or adrenal glands. A part of patients with liver cancer that cannot be surgically resected can be converted to surgical resection after tumor shrinkage or stage reduction by radiotherapy. Internal radiation therapy for liver cancer commonly uses radioactive particle implantation, which is a localized treatment for liver cancer, treating intrahepatic lesions, portal vein cancer clots, inferior vena cava cancer clots, and cancer or cancer clots in the bile ducts. Strontium chloride emits beta rays, which can be used for targeted treatment of liver cancer bone metastases. Liver cancer patients are advised to visit the hospital regularly for review of the disease progression, so that the doctor can adjust the treatment plan according to the condition.