Many uncertain factors in the design process of pavement structure will greatly influence the reliability of the pavement structure.Based on "the Design Standard of Highway Flexible Pavement" and "Unified Standard for Reliability Design of Highway Engineering Structures"(GB/T 50283-1999),according to randomness and variability of all design parameters,this paper expounds the reliability concept of asphalt pavement by means of probabilistic method and stochastic process.Then,the limit equation of pavement co...