Objective:To evaluate the effect of modified surgical techniques on hemostasis used in aortic root replacement with a composite graft（Bentall procedure）.Methods:Data on 15 patients who underwent Bentall procedure during 2005 to 2007 were analyzed.The first 5 patients（Group 1） received the standard procedure.Then next 10 patients（Group 2） received the modified procedure.Techniques including "tandem suture line"

"endo-button buttress"

"sandwich anastomosis" and "left ventricle filling" were added to the standard procedure.Perioperative bleeding and the volume of blood transfusion required were compared to estimate hemostasis in different groups.Results:Between groups 1 and 2

a significant difference was found in postoperative bleeding [（2193±383） ml vs（1012±258） ml

respectively;P<0.05] and in volume of blood transfusion required [（7242±1416） ml vs（2520±708） ml

respectively;P<0.05].Conclusion:The modified surgical techniques used in our study are effective in the improvement of the hemostasis in Bentall procedure.