Radiotherapy in regular hospitals may not be the same, such as radiotherapy target area outline, normal tissue limit and so on with the doctor’s experience has a certain relationship. Radiotherapy, referred to as radiotherapy, is a means to kill tumor cells by radiation, for tumor patients, about 70% of patients need radiotherapy in the treatment cycle, which needs to be formulated according to the patient’s tumor outlining the target area of radiotherapy and the limit of normal tissues and organs, and the amount of dosage. Radiotherapy can be used as a radical treatment technique and means for many tumors, and can also be used for patients with advanced and recurrent tumors as a palliative symptomatic treatment method. Radiotherapy can control the role of tumor, but also can achieve the role of tumor eradication, reduce symptoms, palliative symptomatic, improve the quality of life, and play a very important role in the whole tumor treatment. The process of radiotherapy requires multiple processes such as positioning of the patient, target area outlining, radiotherapy plan development, plan verification and implementation, etc. The process of target area outlining is related to the doctor’s experience, and the accuracy of the plan implementation is related to the machine to a certain extent. Each hospital has different machines. However, radiotherapy is generally well tolerated and can improve quality of life and prolong survival. It is recommended that patients be evaluated by a radiologist to determine if radiotherapy is necessary.