Objective To study the curative effect of endoscopic sinus surgery (ESS).Methods 121 cases (198 sides) of chronic sinusitis and nasal polyps were treated with ESS,and following up one years postoperatively.Results It was found that 86 cases were cured (71.1%),27 cases achieved symptomatic relief (22.3%),8 cases remained failure (6.6%),and the effective rate was 93.4%,mainly operative complication was adhesion of nasal cavity and bleeding.Conclusions The curative effect of ESS was successful,it is very important to the excellent surgical skills and cleaning of the operation cavity after operation,a regularly follow-up,and the treatment of middle turbinate precisionly could reduce operation complications.