Objective：To investigate the cause，clinical menifestation，diagnosis and treatment for ectopic appendicitis. Methods：To－tally 82 patients with ectopic appendicitis were derived from the second affiliated hospital of Chongqing medical university between December 2003 and October 2011. The clinical manifestation and experiences of diagnosis and treatment were summarized and ana－lyzed retrospectively. Results：Sixty-seven cases were correctly diagnosed before operation，11 cases were misdiagnosed and 4 cases had uncertain diagnosis. All patients were given the operation and were confirmed to be ectopic appendicitis during the operation. All patients were discharged successfully after the operation. Conclusions：The clinical manifestation of ectopic appedicitis is diversified，which can easily cause misdiagnosis. At the moment，ultrasonography is the preferred method in diagnosing ectopic appedicitis. La－paroscopic appendectomy has obviously superiority over the other treatments for ectopic appendicitis.