Radiation therapy, together with surgical treatment and internal chemotherapy treatment, are the three major means of malignant tumor treatment. Nowadays, there are also endocrine therapy, biological therapy, etc.), it is a method to eliminate tumor by using rays with strong penetrating ability and energy to cause lethal damage to tumor cells; nowadays, the main rays used in China are deep X-rays generated by gas pedal, gamma rays generated by Co60, in addition to Ir192, Cs137, etc. used in close irradiation. 1.Esophageal cancer radiotherapy As one of the main treatment means for esophageal cancer, radiotherapy has good therapeutic effect when applied to different stages of the disease. For patients with early stage esophageal cancer or those who are not willing to undergo surgery due to other reasons, radiation therapy can achieve therapeutic effects comparable to those of surgery, and some patients have even achieved a survival period of more than 10 years through radiation therapy; for patients with greater difficulty in surgery, they can regain the timing of surgery by shrinking the tumor through pre-surgical radiation therapy: for patients with middle and late stage who have lost the timing of surgery, radiation therapy can be used to relieve the symptoms and improve the quality of life. For patients with esophageal cancer with distant metastases, palliative radiotherapy can also be used to relieve pain and improve quality of life: for patients with cancer residues seen by the naked eye after palliative surgery, cancer infiltration in the stump after postoperative examination, incomplete peri-esophageal lymph node dissection during surgery, and patients with subclinical lesions estimated to be prone to recurrence after surgery, radiation therapy can be used to relieve symptoms and prolong survival. In the past, many patients with esophageal cancer did not undergo post-surgical comprehensive treatment due to fear of radiation therapy, and metastasis of lymph nodes appeared soon after surgery, resulting in symptoms such as hoarseness and choking on water, which reduced the quality of life. Tumor cells have various characteristics, not all of them respond to radiation therapy, and some esophageal cancer cells are resistant to radiation therapy, which is why some esophageal cancer patients have poor effect of radiation therapy. This is why some esophageal cancer patients have poor radiotherapy effect. Then, you can combine chemotherapy drugs or radiotherapy sensitizers with radiotherapy to improve the sensitivity of these tumor cells to radiotherapy, which will not increase the radiotherapy response but improve the treatment effect. 2.Treatment precautions: Radiation therapy for esophageal cancer will affect other normal tissues in the irradiated esophagus, but this is temporary. In addition, common systemic reactions to radiotherapy are weakness, fatigue, dizziness, headache, anorexia, individual nausea and vomiting, etc. Most of them appear 2 weeks after irradiation, while a few appear a few hours or 1-2 days after irradiation, and their degree depends on the irradiated part of the body. It is important to adjust the patient’s diet, except for avoiding overheated and hard food, it is better to use a warm or cool diet with less oil but rich in protein and vitamins, and drinking light alcoholic beverages such as beer in moderation can increase appetite, help digestion and reduce dry mouth. At the beginning of radiotherapy for 2-3 weeks, the patient can have general food, and then gradually change to soft food. At the later stage of radiotherapy, the patient should be given semi-liquid diet or soft food with soup and vegetable. In general, after radiotherapy, patients with esophageal cancer should pay attention to good self-care, take in enough nutritious food and body fluids, get enough sleep, wear loose and soft underwear, and keep the line of radiation field clear.