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According to the statistic of the CNG filling stations accidents and the review of the related literature,the critical positions affecting the CNG filling stations accidents,which referring to the gas selling system,the gas storage system and the natural gas compressing system,are summarized.And the safety evaluation index system of CNG filling station is established.MIMAH is mainly based on the application of the bow-tie.Its centered by the crisis event,comprising by the FTA on the left and ETA on the right.