With 407 cases of Rhinonasal polypsis in ENT Center, from January 1998 to January 2001, in the age of 16 to 60 years, we apply the ethmoidectomy via endoscopic technique and receive high efficacy result: 97% decrease nasal obstruction post op, 0% of orbital and intracranial complications, and specially: 27% has appeared the minimal recurrent polyps on the anterior ethmoid which did not remove, just only use the steroid spray.