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用惰化混合气体的燃烧范围图对烟雾灭火机理进行了研究。认为烟雾灭火的基本原理是喷放烟雾灭火剂后，液体燃料贮罐内各部位混合气体的状态都超出了它的燃烧范围。说明了高于化学计量浓度的可燃混合气体火灾采用烟雾灭火时，易复燃是这种灭火方法本身的必然特点。
The mechanism of smoke extinguishing was studied with the combustion range diagram of inert gas mixture. It is considered that the basic principle of the fire extinguishing is that after the smoke extinguishing agent is sprayed, the state of the mixed gas in each part of the liquid fuel storage tank exceeds its burning range. It shows that the combustible mixed gas above the stoichiometric concentration of fire extinguishing smoke, the easy to re-fire is a necessary feature of this fire-fighting method itself.