Abstract: The design scenario of underground gas storage involves in many factors, no any best design scenario can be taken as only based on some "good" or "bad" factors. Therefore, for the design scenario, a comprehensive evaluation has to be carried out integrally. This paper, take the design scenario of some underground gas storage as an example, determines the factors' weights with the fuzzy analysis of hierarchal process and establishes the mountain subjection degree functions to evaluate comprehensively the different scenarios. The calculation results show that the design scenario determined is in line with the actual scenario, that is to say, this method is available to optimize the the design scenario of some underground gas storage.