Based on the features of Chinese salt rock bed

the comprehensive evaluation system of the stability of rock salt gas storage with multilevel and multi-index has been set up; and the assessment class level of the stability of rock salt gas storage during the operation period also has been defined. According to the test data and the result of numerical simulating

the scoring models of evaluation indices are built and the value of the corresponding evaluation indices for every assessment class is got. The weight of the describing layer and the index layer has been obtained by analytic hierarchy process. Both the extension evaluation and the fuzzy comprehensive evaluation have been used to evaluate the stability of Jintan Xi-1 salt rock gas storage of the West-to-East Natural Gas Transmission Project. And the results of the two above methods are consistent

just like the real situation

which show that it is of great worth to set up the comprehensive evaluation system of the stability of rock salt gas storage with multilevel and multi-index