This　study　aims　to　obtain　the　biomechanical　properties　of　ascending　aorta　and　pulmonary　trunk　between　healthy　humans　and　pigs　of　different　months,　so　as　to　provide　necessary　biomechanical　experimental　basis　for　anastomosing　blood　vessel　in　pig-to-human　heart　xenotransplantation.　Ascending　aorta　and　pulmonary　trunks　of　the　six　deceased　donors　(male　4,　female　2)　and　42　Chinese　Hubei　white　pigs　aged　1-7　months　were　performed　biomechanical　test.　The　blood　vessel　was　given　periodic　permanent　loading　and　unloading,　and　repeated　force-deformation　data　were　obtained.　The　elastic　properties　of　the　blood　vessels　were　obtained　by　curve　from　experimental　data.　The　biomechanical　material　constant　of　ascending　aorta　and　pulmonary　trunk　of　pigs　did　not　increase　with　the　increase　of　age　(F　=　14.569,　P　=　0.126).　The　biomechanical　material　constant　of　humans　was　basically　similar　to　that　of　pigs　aged　1-7　months　(F　=　12.264,　P　=　0.225).　The　elastic　modulus　was　the　biggest　in　pigs　aged　7　months　in　comparison　with　that　in　other　ages　(F　=　27.425,　P　=　0.032).　There　was　no　significant　difference　of　elastic　modulus　of　corresponding　blood　vessel　between　humans　and　pigs　of　different　months　(F　=　17.328,　P　=　0.215).　Our　present　study　suggests　that　there　was　no　significant　difference　of　elastic　properties　of　ascending　aorta　and　pulmonary　trunks　between　humans　and　pigs.　From　biomechanical　aspects,　anastomosis　of　corresponding　ascending　aorta　and　pulmonary　trunks　in　the　process　of　pig-to-human　heart　xenotransplantation　may　be　feasible.