Abstract: The causes affecting on the installation depth of hydraulically preformed pile and the distribution regularities of bearing capacity, taking one power plant in Henan Province as a case, are studied from in-situ tests results in this paper. The study result indicates that the installation depth of the pile and its bearing capacity are affected by the property of foundation soil. In the case study, though the depth of pile is smaller than that designed, the bearing capacity is enough to meet the need of construction.