This study is a prospective randomized controlled open-labeled trial of patients undergoing hemodialysis under the diagnosis of end stage renal disease. The subjects were divided into the treatment group and the control group through random assignment under the condition of receiving hemodialysis steadily and followed up for 6 months. After randomization, the treatment group received beraprost sodium (Berasil) for 6 months (24 weeks) and beraprost sodium will be provided by Astellas Pharma Korea, Inc. Patients were randomly assigned within 2 days after successful arteriovenous graft surgery, and the treatment group started taking 120 mcg of Berasil, while the control group did not take placebo to replace beraprost sodium.