目的：探讨鼻内窥镜手术中额窦开口的确认和处理方法。方法：通过咬除鼻丘气房，开放筛漏斗及前上筛房，必要时切除中鼻甲前端等方法，使全组鼻窦炎４６例的额窦口扩大引流。结果：４６例中３３例获得随访１～２．５年，疗效满意。结论：功能性鼻内窥镜手术处理额窦开口的关键是熟悉窦口解剖变异，认清周围标志，尽量保留窦腔黏膜。 Objective: To explore the confirmation and treatment of the frontal sinus opening during endoscopic sinus surgery. Methods: 46 cases of nasal sinusitis were enlarged and drained by bite removal of nasal cavity, opening of sieve funnel and anterior sieve room, and removal of middle turbinate front if necessary. Results: Of the 46 cases, 33 cases were followed up for 1-2.5 years, with satisfactory results. Conclusion: Functional endoscopic sinus surgery frontal sinus opening is the key to familiar with anatomical variations of the ostium, identify the surrounding signs, try to keep the sinus mucosa.