Based on the analysis of bearing capacity calculation method of the CFG-piles composite foundation, according to the interval and fuzzy characteristics of its influence factors, triangular fuzzy numbers were used to express the calculating parameters, and then the fuzzy analysis model of bearing capacity calculation of CFG-piles composite foundation was presented. Triangular fuzzy parameters of bearing capacity of CFG-piles composite foundation were proposed by discussing the method to determine triangular fuzzy numbers. And then, based on the given safety factors and the bearing capacity design method to get performance functions, the level-sets technique and interval number algorithm were introduced to establish the fuzzy possibilistic reliability analysis method for bearing capacity of CFG-piles composite foundation.