Adenoid cystic carcinoma is generally difficult to be cut due to its neurophilic nature and early occurrence of distant metastasis, and although it grows slowly, it is extremely aggressive, and the application of radiation particles has better efficacy. Traditional radiotherapy is almost ineffective. The effect of fast neutron radiotherapy is six times that of ordinary radiotherapy, but it is far less than that of radioactive particles. Adenoid cystic carcinoma has the following characteristics: 1. The scope of naked eye lesion does not match with the microscope at all, and a clinical 1 cm lesion cannot be cut after extensive resection of several centimeters; especially the palatal lesion. The extent of lesion does not match with the systemic condition at all, and the patient may not feel any discomfort due to metastasis in both lungs; 3. The course of disease does not match with the degree of malignancy at all, most of adenoid cystic carcinoma can survive for more than 5 years without treatment, but the extent of local invasion, metastasis, and the degree of difficulty in cutting is very obvious. Some people already have metastasis in both lungs at the time of initial diagnosis. Postoperative patients are usually reviewed once every six months, mainly to check local and pulmonary areas. If there are pulmonary metastases, the liver also needs to be checked. Most adenoid cystic carcinomas can survive for several years, some for more than 20 years, while the solid necrotic type has a poor prognosis. Adenoid cystic carcinoma of the parotid gland is prone to facial paralysis, which can be treated with radioactive particles only without surgery. After 1-2 months of treatment, the swelling will become soft and disappear, and facial palsy can be recovered. After surgery, supplemental radioactive particles are recommended. Since the half-life of radioactive particles is 59 days, they have no effect at all after 200 days. If the tumor disappears completely after 2-3 months of treatment, it can be observed, or radioactive particles can be implanted again after 6 months. According to the clinical application, through more than 5 years of observation, the vast majority of them can be implanted once, there are 2 cases implanted twice and 1 case implanted 3 times. However, due to the slow growth of the disease itself, it remains to be observed whether it can be completely cured. One thing is for sure, this method is very effective in controlling the growth of adenoid cystic carcinoma, which is unlike any other method so far. The amount of radioactive particles implanted depends on the tumor volume, and the amount of radioactive particles can be significantly reduced after tumor removal.