Abstract: On the basis of researching working principle of inert gas generator, influence factors of fuel combustion and the relationship between inert gas composition and wind-oil ratio, field application technology of inert gas generator is analyzed. Application Research of inert gas generator in emergency shows that the practical application of inert gas generator may face difficulties such as unqualified inert gas composition, difficulty in judgment on fire area extinguishing, inert gas generator extinguishing. It should seal disaster area reasonably and ensure inert gas generator working effectively in application.