Abstract: This paper focuses on the model pile settlements induced by different cyclic loading ratios in saturated sand.The cyclic loading ratio is defined as the ratio of the maximum cyclic loading to the ultimate bearing capacity of the pile.Through three kinds of tests on model piles with the cyclic loading ratio of 12.5%,25% and 50%,the cumulative settlements of the model piles are studied in saturated sand,and it is investigated that how the dynamic displacements change with cyclic numbers.Then the fitting equations of the settlement curves are derived from the test data.The results show that the cyclic loading ratio and cyclic number are the important factors of the cumulative settlement of piles.