Abstract: Considering that the stability influencing factors of the salt rock gas storage during the operation period are complex, using analytic hierarchy process, the salt rock gasstorage's stability evaluation index system during the operation period is established. based on the indexes' weight distribution and judgment matrix, combining with the application of the grey correlation analysis theory, the stability grey correlation evaluation model of the gas storage during the operation period is established. Combining the indexs' correlation coefficients and weights, taking the correlation degree as quantitative indexs, the gasstorage's stability during the operation period is analyzed and compared. With practical engineering examples, this evaluation model is applied to three operating gas storages, the result shows that it accords to the numerical simulation result, and the evaluation model is proved reasonable and practicable.