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Blending a certain proportion of hydrogen into the natural gas and using the existing natural gas pipelines or pipe networks for transportation is considered to be an effective way of large-scale hydrogen delivery. Because the minimum ignition energy of hydrogen is far lower than that of natural gas, and the lower explosion limit of hydrogen is smaller than that of natural gas, it is more likely to cause explosion accidents after the leakage of hydrogen-enriched natural gas, resulting in serious accident consequences. In this paper, FLACS software is used to study the explosion accident of hydrogen-enriched natural gas in an indoor confined space, and the influence of hydrogen blending ratio, ignition point location, ventilation of computational domain and combustion degree on the accident characteristics and evolution law of hydrogen-enriched natural gas explosion is analyzed. The results show that the higher the hydrogen blending ratio is, the earlier the explosion occurs; The closer to the ignition point, the earlier the temperature and overpressure begin to change in the explosion process; The explosion power of hydrogen-enriched natural gas in the confined space is much greater than that in the open space; The higher the equivalence ratio is, the stronger the explosion power is. [ABSTRACT FROM AUTHOR]