Abstract: HAZOP technology is a qualitative risk assessment method used to identify the design defects, process hazard and operability problems. It mainly finds the consequences and the cause of the accident through deviations, and on the basis of existing protective measures, it proposes the suggestions to control or reduce risk measures. Because of its advantages of systematic and scientific, HAZOP has been widely used in petroleum, chemical industry, etc. In view of the underground gas storage well growing problems such as corrosion, aging, this article used the HAZOP technology to analyze CNG underground gas storage well safety for the first time. The article proposed 94 measures and the adoption rate could reach more than 90%, which provided a strong basis for the production safety management. Meanwhile, the advantages and disadvantages of HAZOP technology were summarized, and the direction of future improvement was clear-cut.