Objective To provide clinical reference data on the stress-relaxation and creep- viscoelastic properties of renal arteries from fresh and healthy human cadavers. Method stress-relaxation and creep- viscoelastic tests were conducted for the renal arteries. Results The stress-relaxation and creep data were obtained. By regression analysis, the characteristics of the normalized stress-relaxation and the normalized creep behavior were established. Conclusion There was a big variation in the relaxation and creep behavior during the first 600 seconds of the testing. At 7200 seconds, the stress-relaxation and creep curve reached the equilibrium. At the time of 7200 seconds the measures of relaxation was 0.280 MPa and that of creep was 13.98%. These results suggested that the renal arteries belonged to solid biological materials characterized with viscoelastic properties.