The design bearing capacity of piles can be calculated by multiplying the characteristic value with its corresponding resistance factor. In this study, we proposed a method for calculating these parameters from a loading test database of several different construction methods. Initially, we proposed the formula for calculating the characteristic value by using results from a ground investigation. Secondly, we proposed the resistance factor obtained from the statistical analysis of the loading test database by use of the first-order reliability method. The proposed method can be used to compare the effectiveness of various pile construction methods with the same reliability.