Who are suitable for treatment with trigeminal nerve radiofrequency thermal coagulation? 1.Primary trigeminal neuralgia with poor effect of medication; the side effects of medication are difficult to tolerate. 2, unwilling to accept cranial trigeminal nerve vascular decompression 3.Patients with trigeminal neuralgia who are old and frail and cannot tolerate craniotomy treatment. 4.Patients who have relapsed after trigeminal neurovascular decompression. 5.The effect of gamma knife treatment is not satisfactory. 6.Patients who relapsed after radiofrequency thermal coagulation treatment.