Abstract: The total pile resistance is compared with the end resistance, and the influence of shaft resistance on particle size effects in pile centrifuge tests is studied. For the same prototype, because the mobilization of the shaft resistance is different, the values of the shaft resistance obtained from the tests with different model piles are not the same. On the other side, the particle size effects on the end resistance almost can be ignored except the slender ratio is 5. Because of the shaft resistance, the particle size effects on the total pile resistance are more marked than those on the end resistance under the same condition.