Abstract: It's hard to describe and evaluate the health condition of buried pipeline by means of analytical model because it is influenced by many hctom and manifest such as cracks,pits,tuberculation,etc.To take full advantage of the redundancy and complementarity of inter-level information,a multi-source and multi-level data fusion approach based on vague sets is proposed.The mathematical description of vague sets based multi-source information is defined and the corresponding model is developed.The data organization,the evaluation method and the implementation of the hierarchical algorithm are discussed.Finally,the proposed approach is applied to a lined cast pipeline health condition evaluation,and the result shows it is valid and reasonable.