Abstract:In-situ horizontal loading tests of pile foundation for an eleven-storey building on a soil slope are carried out. Combining testing results with the physical and mechanical properties of the slope soil, and the parameters of piles, it can be concluded that (1) the foundation structure design controlled by displacement consideration for the building is safe,(2) the mechanical response of piles obviously changes with the variance of distance from a pile to the soil slope to some extents, and when the horizontal displacement of pile is known, the shorter the distance is,the greater the horizontal bearing capacity of a pile is,which reflects the fact that the piles closer to a soil slope are under the greater three-dimensional static pressures,and (3) the bearing capacity of a pile is not related to the relation between loading direction and the slope inclination direction. This means that the soil slope is of homogeneous property,which is different from rock slope with strong directional influence due to geological structures of rock mass.