Experiment was conducted by preparing several mixed gas samples with different concentrations of NO and NO2
and their spectrum were scanned.The quantitative analysis model of mixed gas was established with extreme learning machine(ELM) method
and to make the performance of the model better
the connection weights between input and hidden layer and the thresholds of hidden layer was optimized combining the genetic algorithm.The results show that the extreme learning machine model can be used as a quick and convenient method for analyzing the concentration of each gas component in mixed gas.