Abstract: Based on the fuzzy analytic hierarchy process, durability assessment of underground drainage pipeline in service was evaluated according to several components. Considering the effects of various defects on the durability of components, the weight of each layer index was given, and a fuzzy comprehensive evaluation model for the durability of drainage pipeline was established. The model was used to semi-quantitatively comprehensively evaluate the durability of the drainage pipeline, and the residual life of the drainage pipeline was predicted based on the evaluated durability. The method was used to evaluate the residual life of the drainage pipeline section in a southern city, for verifying the feasibility of the method. This method scientifically simplifies the complex durability life evaluation of drainage pipeline, and can provide reference for the maintenance, reinforcement and durability life evaluation of old drainage pipeline in city.