Objective:　To　determine　the　age-related　biomechanical　properties　of　human　costal　cartilage　and　to　offer　theory　reference　for　clinic　to　forecast　the　effect　after　shape　and　select　the　best　operation　time.　Method:　Human　costal　cartilages　were　harvested　from　25　female　and　45　male　donors　of　5-25　years　old　after　auricular　reconstructive　surgery.　The　specimens　were　divided　into　six　groups:　children　(5-10　years),　adolescent　(11-17　years)　and　adult　(18-25　years),　respectively　in　males　and　females.　Tensile　strength,　stress-strain　relationship,　stress　relaxation　and　creep　were　tested　by　using　a　material　testing　machine.　Result:　The　biomechanical　properties　of　costal　cartilage　are　donor　age　and　gender　related.　The　children　group　has　the　highest　tensile　strengths　(P　＜　0.01)　in　both　male　and　female　groups.　The　male　group　relaxed　and　creeped　more　than　that　of　the　female　group　in　all　three　age　groups　(P　＜　0.01).　Conclusion:　The　childhood　should　be　first　considered　in　orthopedic　operation　using　rib　cartilage　to　shape　ear　reconstruction.