OBJECTIVE:To observe the clinical efficacy of omeprazole plus colloidal bismuth pectin and amoxicillin in the treatment of duodenal ulcer(DU) and on which a cost-effectiveness analysis was performed.METHODS:80 patients with DU were randomly assigned to receive omeprazole+colloidal bismuth pectin+amoxicillin(Group A,n=40) or omeprazole+clar-ithromycin+amoxicillin(Group B,n=40).After the completion of treatment,gastroscopic examination was performed to observe the cure rate of DU and the improvement of clinical symptoms.The cost-effectiveness ratios were compared.RESULTS:In the two groups(A vs.B),the cure rates under gastroscope were 100.00% vs.87.50%(P