Abstract: In fuzzy variable weighting method, evaluation weight varies with evaluation vector. This method can help policy makers to find the impact of the low-level evaluation on the whole plan and the degree to abandon it. In this paper, fuzzy variable weighting method is used to select design project of underground gas storage, the weight of the aspect in low-level on the comprehensive evaluation is added and the abnormally low-level projects are stuck out to attract the policy makers' attention. Through the example, it is proved that the sorting of constant weight and variable weight are different and the latter is more reasonable. Therefore, fuzzy variable weighting method can be applied to the same project selection.