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A highly reliable traffic network was very important after a disaster, and the network reliability could be improved and maintained by many methods. However, it was difficult to improve more reliable links than less reliable links which has not been considered in most of current methods. Therefore, this paper proposed a method for improving link reliability which was combined the cost-benefit function with the criticality importance. A model to identify the relationship between the cost and reliability from the point of view of the efficiency of local government was proposed. The result that the strategy to improve the link reliability should be changed according to the different investment strategies and the different government efficiency has been got based on our models and discussion.