Objective To research the viscoelasticity of the cancellous bones of the OS femoris' upper part of the fresh body of our country and provide parameter of biomass for clinical. Methods The experiment on the extending stress relaxation and creep in directions of vertical vertical. Results By using logarithmic and exponential regression analysis method we obtained the reduced stress relaxation and creep curves. Conclusions The extending stress relaxation grade of the cancellous bones of the OS femoris' upper part is 7 200 s, relaxation is 0.422 MPa, the quantities of creep is 0.784%.