分析了隧道火灾的特点，运用区域模拟和场模拟的方法，通过一假定的隧道火灾算例，分析了几种不同情况下隧道火灾的烟气发展情况。讨论了烟气温度、高度的变化情况，得到了不同区段火和烟气对人构成威胁和对隧道结构造成破坏的情况，最后对隧道火灾的防治提出了一些建议。

With the development of transportation, the road and railway tunnels are more and more in the world. But great loss due to the tunnel fires happened in recent years shows that the tunnel fire safety is a problem. Realizing the characteristics of tunnel fires is very important for the tunnel fire protection. In this paper, given a tunnel, the smoke development in different situations was simulated using zone model (CFAST) with the multi-cell concept and field model (FDS). The smoke temperature distribution and smoke layer interface height were discussed. And the comparisons between these two models were made. The harm of fire and smoke to people and tunnel lining at different position was also discussed.