The salt mines in China have the properties of shallower burial depth

lower thickness

multiple interlayer and lower grade

which will cause more technical risks for construction and operation of underground salt rock gas storage. Based on fuzzy comprehensive evaluation of risk factors of gas storage

the paper has established a hierarchical analytical model of risk evaluation of three risk accidents that storage destruction

gas leakage and surface settlement for salt rock gas storage. The model has been used to evaluate operation risk condition of Jintan salt rock gas storage in Jiangsu Province. The effected weights distribution and risk grade of three risk accidents have been determined. The research results indicate: (1) Lower pressure and operation time of low pressure and stress state of pillar should be controlled to avoid gas storage destruction; (2) Position of casing shoe

sliding of interlayer surfaces

high pressure and damage of pipeline valves should be controlled to avoid gas leakage; (3) The roof thickness

lower pressure and operation time of low pressure should be controlled to avoid surface settlement of gas storage; (4) Storage destruction and gas leakage belong to middle risk

while surface settlement of gas storage belongs to high risk. The effected weights distribution of three risk accidents and risk grade provide theoretical guidance for risk regulation of underground salt rock gas storage in China.