In order to make better research on the weighting methods of case attributes in Case-based Reasoning, we conduct a study on the weighting methods of case attributes, in which a number of 50 metro energy consumption cases is chosen to conducted to verify the three weighting methods on attributes of the case in the metro energy consumption data base. The three weighting methods are Analytic Hierarchy Process, abbreviated as AHP, Mean Square Difference, abbreviated as MSD, and Integrated Determination of Variable Weight, abbreviated as IDVW. The results of this study clarified that the new method IDVW can improve the retrieval quality of the metro energy consumption case, and retrieve the most efficient metro train route map quickly, which can realize the decline of metro energy consumption effectively.
