Abstract: The design method of the vertical compression bearing capacity of cast-in-place piles from one safety factor to partial factors is discussed.The reliability theory and one-dimensional random field theory are employed.For the three types of design methods to determine the vertical bearing capacity of cast-in-place piles in Shanghai area,theoretical formulae of partial factors are obtained.To derive the bearing capacity based on empirical correlation,the characteristics of earth strata are taken into account.To deduce the bearing capacity based on the specific penetration resistance of cone penetration test,both of the characteristics of earth strata and the correlation between soil properties are considered.Three formulae to calculate the partial factors of resistance are deduced,and the computational methods of partial factors of resistance are explained.