Radiotherapy for laryngeal cancer can be divided into postoperative radiotherapy and radical radiotherapy or radiochemotherapy. The total number of adjuvant postoperative radiotherapy is 30 times, 2Gy each time, with a total dose of 60Gy, which takes 6 weeks; those who are unwilling and unsuitable for surgery in early stage can take radical radiotherapy, the number of times and dose will be higher, irradiating 35 times, which takes about 7 weeks. In addition, before radiotherapy, it is necessary to prepare the localization CT, the doctor outline the target area, the physiotherapist make the radiotherapy plan and approval, as well as reset and confirm before treatment, the total process takes 1-2 weeks.