Based on the analysis of the tunnel fire environment and the characteristics,the temperature,smoke and CO are selected as the main parameters of the tunnel fire detection.Based on neural network,the mathematical model is set up.With study algorithm of neural network,the model can identify tunnel fires.The result of MATLAB simulation of tunnel fire shows that the correct recognition rate of tunnel fire is high.The false-alarm can be decreased.The suitability of this system to environmental variation can be o...