Abstract: A serious attention has been drawn to the continious subsidence of vibrating pile foundations rested on a medium dense gravel stratum.This paper deals with the problems of bearing capacity of single pile under long-term vibration. The procedure of vibratory loading test on pile in-situ is produced and the characteristics of pile settlement are described as well. The reasons that cause the plastic deformation appearing ahead are also clarified. Finally, based on the test data, authors introduce a conception of long-term bearing capacity of pile, and also a method determining the bearng capacity of single pile is presented.