Some time ago a high school boy, due to repeated frontal and interbrow area pain, dizziness and heaviness, and nasal congestion, nasal discharge, seriously affected sleep and study, almost to the point of unbearable, had many times in the local hospital drug conservative treatment, no significant effect, after sinus CT examination, diagnosed as frontal sinusitis. Considering the heavy study task and time constraint, he was worried that the hospitalization surgery would affect his study, first he hesitated for some time, and finally it was really unbearable and he decided to consider the surgery treatment accompanied by his family. The patient’s symptoms of brow pain basically disappeared on the day after the surgery, and he slept peacefully, and his whole mental state changed completely, and he was discharged from the hospital 4 days after the surgery. When he came to the follow-up clinic after the surgery, he said that not only did the surgery not delay the revision time, but also the post-operative sleep and study efficiency improved, which contributed to the improvement of his academic performance, and he played well in the college entrance examination. Such patients are often encountered in outpatient clinics, and some patients who suffer from this condition for a long time also feel that life is worse than death, and even have suicidal thoughts appear. Therefore, frontal sinusitis is, in a sense, a sinus disease that seriously affects a person’s quality of life and must attract our attention. Because the frontal sinus belongs to the anterior group of sinuses in the sinuses, the drainage is special, and the drainage channel is also extremely narrow, in the case of nasal inflammatory infection, it is easy to develop lesions that block the drainage of the sinuses, and once the onset of the disease, it is not easy to reverse, resulting in significant forehead pain between the eyebrows and recurrent attacks, which seriously affects the quality of life. Clinical treatment for frontal sinusitis is generally conservative first, and only some patients can get relief and gradually return to normal, but a considerable number of patients transform into chronic frontal sinusitis, which becomes a major nuisance in daily life. In most cases, chronic frontal sinusitis still requires nasal endoscopic surgery, due to the special angularity of frontal sinus, it is often not easy to open completely under 0 degree nasal endoscope, and it needs to use angle endoscope, while the operation of angle endoscope is relatively difficult, the corresponding supporting special instruments are still relatively expensive, and most hospitals are not equipped as a routine, resulting in the treatment of frontal sinus frontal crypt often leaves some problems, which also This is the reason why some patients have had frontal sinus surgery, but the postoperative effect is not good. Of course, the postoperative efficacy is also related to the nature of the lesion, metaplasia, postoperative endoscopic cleaning, comprehensive drug treatment, and many other factors, but the degree of intraoperative treatment of the frontal sinus drainage opening is a rather critical part. Based on our experience in specimen dissection and clinical practice, we have designed inexpensive domestic surgical equipment, and with the operation of angled endoscopy, we have accumulated experience in a considerable number of patients with frontal sinusitis. In the treatment of intraoperative frontal sinus drainage opening, we found that in this narrow area, there often exist irreversible lesions, such as local pus accumulation, mucosal polyp-like changes, anatomical obstruction of air spaces, osteophytes, etc., which require surgery to be completely resolved. After these factors are treated under direct endoscopy, the patient’s symptoms are often relieved and disappear immediately, with regular postoperative cleanup and medication to achieve a cure. Many patients, whose work and study were seriously affected, gave us feedback during the follow-up visit that they were too tormented by this disease in the past, and should have come for the surgery long ago if they had known such efficacy. However, because of the special characteristics of the frontal sinus itself, it is still challenging for rhinologists to operate the angled endoscope skillfully; in addition, it must be equipped with the corresponding special instruments for operating under the angled mirror; also, the most important point is that the operator must fully understand the patient’s frontal sinus drainage and spatial positioning according to the CT thin-layer scan and 3D reconstruction before the operation, so as to The surgeon must have a good understanding of the patient’s frontal sinus drainage and spatial positioning based on CT thin scan and 3D reconstruction, so as to avoid the occurrence of cerebrospinal fluid nasal leakage, intracranial infection and orbital complications; finally, there must be a relatively skilled surgical team to cooperate, because any surgery cannot be done independently by one person alone.