During　the　past　6　years,　we　have　treated　406　patients　with　classical　silicone　augmentation　rhinoplasty.　The　types　and　incidence　of　complications　after　subcutaneous　or　subfascial　implantation　were　examined.　We　have　proposed　that　most　complications　are　related　to　the　depth　of　the　implant　and　the　character　of　the　tissues.　In　order　to　improve　our　operation　and　prove　our　hypothesis,　we　performed　subperiosteal　augmentation　rhinoplasty　in　22　cases　with　satisfactory　results.　In　order　to　determine　scientifically　which　layer　the　silicone　implant　should　be　inserted　into,　we　investigated　the　biomechanics　of　human　nasal　periosteum　and　fascia,　including　tensile　strength,　stress-strain　relationship　and　stress　relaxation　characters　under　uniaxial　tension.　Although　having　less　failure　strain,　the　periosteum　has　more　tensile　strength　than　the　fascia.　So,　in　the　view　of　biomechanics,　the　periosteum　is　thicker,　tougher　and　stiffer　than　the　fascia,　thus　is　more　suitable　for　covering　silicone　implants.