In order to reveal the friction characteristics of elastic soft tissues under dynamic loads,the small intestine of rabbit is selected as a sample to test its friction characteristics in different stress- strain states,with steel No.45 base- ball,silastic base- polymethyl methacrylate (PMMA) ball and Teflon base- ball as the coupling parts.The re-sults obtained with steel base- ball coupling part indicate that the average friction coefficient of the small intestine in-creases with the radial strain in a period- like law,and the results obtained with the silastic base- PMMA ball cou-pling part indicate that the average friction coefficient increases with the normal load in the presence of radial strain.Moreover,it is found from the results obtained with Teflon base- ball coupling part that the average friction coefficient decreases with the increase of normal load in the presence of axial strain.