There　are　a　lot　of　controversies　that　on　which　layer　the　silastic　implants　should　be　inserted　in　the　augmentation　rhinoplasty,　i.e.　subperiosteal　or　deep　subfascial.　This　study　is　to　investigate　the　biomechanical　properties　of　human　nasal　periosteum　and　deep　fascia,　including　tensile　strength,　stress-strain　and　stress　relaxation　characters　under　uniaxial　tension　system.　The　periosteum　is　stronger　in　tensile　strength　than　that　of　the　fascia,　but　it　is　less　elastic.　Under　a　sudden　increase　of　load,　the　periosteum　relaxes　far　less　than　the　fascia.　Therefore,　in　view　of　biomechanics,　the　periosteum　is　thicker,　tougher,　stiffer　and　less　relaxation　than　facia,　and　thus　has　a　better　fixation　effect.