Abstract: Statistical analysis on the bearing capacity of 78 bored piles and 128 drilled piles and on the normalized parameters of these piles’end and side resistancewas carried out. It is found out by comparison that the ratios of the measured values to the calculated ones of the bearing capacity, the end resistance and the side resistance conform to lognormal distribution. Meanwhile, the total piles’reliability indexes are calculated by calibration method, with a result showingthatthe reliabilityof the bored piles is 4.11 and the drilled piles 4.56.