Based on the ordinary residential buildings as the research object, considering the leakage characteristics of indoor gas, using computational fluid dynamics, Fluent simulation software is used for 2 d simulation of leakage and diffusion of indoor gas, the leakage and diffusion of indoor gas is analyzed. The results show that: (1) the ignition point 1 in about 295s reaches the explosion limit; (2) when the kitchen door is opened, the ignition point of 2 in 14316s reaches the explosion limit; when it is closed, the ignition point 2 reaches the explosion limit for a long time.%以普通的居民住宅为研究对象,考虑室内燃气泄漏的特点,利用计算流体动力学,通过Fluent模拟软件对室内燃气泄漏后的扩散情况进行二维模拟.分析室内燃气泄漏扩散情况.结果表明:(1)点火源1在295s左右时达到爆炸极限；(2)厨房门开启时,点火源2在14316 s时达到爆炸极限；关闭时,点火源2达到爆炸极限的时间很长.
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