The statistical study on the ultimate point load and the point load-point settlement curves of cast-in-place concrete piles were performed. The main conclusions are summarized as follows. (1) The ultimate point load is defined as the point load that the point settlement reaches 10 percent of the pile diameter, and the regression equations between the ultimate, point load per unit area and three average JV-values are proposed. (2) The empirical formulas of the point load-point settlement curves in process of loading are proposed. (3) The regression equations between two point spring constants and the average N-values are proposed.
