Bridge durability evaluation is a complex process involving large amount of data and expertise which are usually imprecise and subjective. For the improvement of the effectiveness and objectivity of the evaluation process, this paper proposed a new method based on grey relation analysis and variable weight method. Influence factors for two-way curved arch bridge durability were summarized, and then a multi-level evaluation model was established with the AHP methods,and the constitution characteristics of two-way curved arch bridges were taken into consideration. Grey relation coefficient was used to evaluate the durability condition, which proved to be effective and objective. Finally, a case study was provided to illustrate the implementation process of the approach for bridge durability evaluation. The present methodology, simple in process and convenient for actual use, will greatly help decision makers and bridge inspectors.