Objective To explore the etiology， symptoms， diagnosis and treatment of ectopic teeth and supernumerary teeth complicated with maxillary cyst.Methods It was reviewed for the clinical material of 6 cases of ectopic teeth or supernumerary teeth with maxillary cysts treated by Tianmen First People’s Hospital in the past 5 years. And the characteristics of diagnosis and treatment were summarized.Results There were 7 ectopic teeth and supernumerary teeth in 6 patients, all of which were complicated with maxillary cyst, 1 left upper canine was ectopic to left nasal cavity. In 6 patients, one left premolar was ectopic to left orbital floor, one left upper canine ectopic to left maxillary sinus lacrimal recess area. There was one ectopic supernumerary teeth in the left maxillary sinus floor, and three supernumerary teeth in the right maxillary front.Five patients were successfully operated on once. One patient was treated only the cyst, but not the ectopic tooth. Oral fistula of the patient occurred 2 months later, and the ectopic teeth were removed again 8 months later. Transnasal approach under nasal endoscope was performed in 3 patients. Two patients underwent Caldwell-Luc approach, and one underwent endoscopic sinus surgery combined with Caldwell-Luc approach and resolved after 3 months. Two patients developed facial numbness after Caldwell-Luc approach for 3 months,There was no recurrence or other complications in 6 patients.Conclusions Ectopic teeth and supernumerary teeth complicated with maxillary cyst often show facial protuberance.Such patients can be the first visit to the Otolaryngology， otolaryngologists need to pay great attention to avoid missed diagnosis.According to the position of the teeth and the extent of the cysts involved and the experience of surgery, a reasonable surgical approach was chosen. Compared with the Caldwell-Luc approach, the endoscopic transnasal approach has less injury and lower complication rate.