Abstract: Based on the static load tests, load-settlement curves of a single capped rigid pile and forces on pile top are monitored. The width of square cap is 1.5 m. The load sharing ratio of cap-soil contact pressure increases with the increasing total load. For the other single capped rigid pile, the sand cushion 0.5 m in thickness and rigid square plate (a larger cap) 2.5 m in width are placed. The load-settlement curves and the pressures on the surface of the cap and the ground are measured. The load sharing ratio of the ground under rigid plate decreases with the increasing total load. The mentioned effect of the cap is in accordance with that analyzed by finite element method.