Esophageal cancer, is a malignant tumor that is very complicated to treat. Its occurrence is usually related to poor diet and lifestyle habits, including smoking, alcohol, hot and spicy food, long-term stimulation of ammonium nitrite compounds, nutritional deficiencies, environmental, biological and genetic factors, etc. Due to the different stages of tumors, the treatment modalities for esophageal cancer will be very different. Generally, doctors will make reasonable individualized plans according to the specific conditions such as clinical stage, location of lesion, extent of invasion and general status of patients. In terms of different stages, radical radiotherapy and surgery have similar effects for patients with early-stage esophageal cancer, while patients with intermediate and advanced stages often choose preoperative radiotherapy or radical radiotherapy. In terms of different sites, radical radiotherapy should be preferred for cervical and upper thoracic esophageal cancer because of the higher risk of surgery, while radiotherapy and surgery for lower and middle thoracic esophageal cancer have similar efficacy. Although, most patients still consider surgery as the first choice for treating esophageal cancer, there are still many patients who choose radiotherapy for the first time for various reasons. Radiotherapy has been used in clinical practice for decades and is another local treatment means other than surgery. In the past 10 years or so, due to the development of technology, radiotherapy has now shifted from two-dimensional to three-dimensional and from fuzzy to precise era, and has become one of the main methods of esophageal cancer treatment. However, some radiotherapy patients may still experience local side effects, which are related to the irradiated volume and dose in the development protocol. For example, radiation esophagitis, which mostly occurs in the middle and late course of radiotherapy, is manifested by burning sensation behind the sternum, painful swallowing, and increased difficulty in swallowing. Perforation of the test tube may occur. Before perforation, symptoms such as choking and coughing, sputum, chest and back pain and fever are mostly seen. Tracheal reaction, mostly manifested as irritating dry cough or sputum not easily coughed up. Long-term side effects, such as radiation pneumonia, pulmonary fibrosis, esophageal stenosis, etc., may also occur. Therefore, patients are recommended to choose professional oncology hospitals and radiotherapy departments for consultation and consultation, one is the experienced doctors who make plans, and the other is the most advanced equipment, which is incomparable to ordinary hospitals Previously, the efficacy of esophageal cancer was limited, and the 5-year survival rate was only 20-30%. In recent years, the Department of Radiotherapy of Bayi Hospital has significantly improved the efficacy of esophageal cancer by strengthening multidisciplinary collaboration and adopting integrated treatment modes such as simultaneous radiotherapy and preoperative radiotherapy. In addition, through the introduction of top radiotherapy equipment and international leading technology, while increasing the killing effect of tumor, the damage to normal tissues has been greatly reduced.