Abstract: The formula for evaluating the loading force of the bored piles has been obtained by the data of static cone penetration (CPT) and static load test. Based on the model of one-dimension stationary Gaussian random fiekls of soils around the pile, the method of correlative function and wariable function is adopted to calculate the relevant range of the soils. Then the probability distribution of the capacity of the site piles is checked and the relevant statistics parameter is evaluated. Considering the efficiency of the bored piles, the impact has been obtained by using the data of the pile settlement. A1 last, the reliability index of the single pile and the bored piles has been calculated and compared the result to that doesn't consider random fields model. The reliability analyses of bearing capacity of bored piles has been carried out.