The purpose of this work is to investigate the mechanical properties of patellar tendon, Achilles tendon and it's insertions. In the experiment three types of insertion was found under microscopy. They are trochlea, pulling, and pulling--inflectlve insertion. The stress-strain coefficients had great difference between tendons and insertions. The mechanical strengths of tendons were more higher than the trochlea and pulling' inflective insertion. The difference of strengths between tendon and pulling insertion has not significant.