Lower gastrointestinal (GI) bleeding with different causes was studied with fiberoptic coloscopy in 022 patients,and the endoscopic features were discussed.Of the 922 cases,colonic polyps were identified in 354 cases (38.4%),and neoplastic polyps in 10 (5.36%).in which villous adenomas was the most common,accounting for 47%.Large intestinal cancers were diagnosed in 134 cases (14.5%) and inflammatory bowel disease in 50 cases (5.4%).The etiology of the bleeding also included infectious diseases in colon,such as tuberculosis,amebiasis,schistosomiasis,idiopathic solitary colonic ulcer.Rarer causes of the lower GI hemorrhage included di-verticulum,hemangioma and trichuriasis.