Objective Study on the mechanical properties of the normal and osteoarthritis knee joint cartilage of ordinary person. Methods Make the tensile test of one dimension on the normal and the morbid knee joint cartilage with Shimadzu AUTOGRAPH electronic universal testing machine. Results Got the data of the maximum load, the tensile ratio, the stress, the strain and the elastic modulu. To deal with the data of stress and strain by least-squares fit, the stress-strain formula and the curves were got. Conclusion The experimental results show that all the mechanical property indexes of the morbid group are obviously lower than those of the normal group.