Objective Research on the viscoelastic properties of L5 lumbars got from fresh corpse of our country. Methods Make the stress relaxation test and the creep test on them with Shimadzu AUTOGRAPH electronic universal testing machine. Results The stress relaxation and reduced creep data and the curves of L5 were obtained. The reduced stress relaxation and reduced creep function and its curves were also gained, together with the regressive coefficient a,b,c and d. Conclusion The L5 spine's stress relaxation quantity is 0.261MPa and the creep quantity is 0.217%.