Objective To investigate the diagnosis and surgical treatment of splen aneurysm.Methods The diagnosis and surgical treatment of 12 patients with splen-aneurysm are analysed retrospec tively between 1987 and 2000.Results The clinical findings of most cases were urgent and critical including 8 patients of severe abdominal pain,2 patients of disruption and bleeding of tumor body,4 abdominal pain and u pset,andabdominal impulsive mass,except that 1 patient had no clinical finding owing to health survey.Ultrasonic examination by color Doppler＇s method was the most essential means in diagnosis,even if a patient was suspected having disrupt ion and bleeding of tumor body,he should be given up to do ultra-B examination b edside.All patients were operated in emergency or deadline and had no allo-blood supply of spleen and no perioperative death.Conclusions Al most all patients obtained final diagnosis by depending on Ultrasonic examinatio n by color Doppler＇s method.We suggest that the ligation of splenic artery aneur ysm be selected as far as possible according to several patient＇s conditions bec ause it has simple?safe and effective speciality.