Abstract: The effect of crack failure of stabilizing piles on the global static and dynamic stability of soil slopes should be properly evaluated in order to check the design in practice.Two dynamic centrifuge tests on soil slopes reinforced by model concrete piles were performed.In model test 1,cracks occurred at the ends of piles due to the static load and the piles were broken completely after the excitation of an earthquake.In model testz,the piles worked well during the static state and the cracks occurred at the ends of piles during the earthquake.According to the observation and the test results,the characteristics of moment distribution in the two different crack failure patterns could be compared.In model test 1,because of cracks due to the static load,the moment distribution in model concrete piles presented the trends of parabola shape from the beginning of the excitation of the earthquake,and the fixed ends of piles converted to the hinge joints.In model test 2,the moment in piles increased firstly and then decreased owing to the cracks resulted from the earthquake and finally the residual moments were less than the values in the static state.