In this paper, we present a method of measuring the industrial gas pollutant emissions concentration by using differential optical absorption spectroscopy (DOAS). The dust and water vapor which affect the spectrum fitting are filtered by the sample and pretreatment system. In order to avoid the photolysis of SO2 with high concentration, the pretreated smoke mixtures are heated to 150 ℃. In the process of DOAS retrieval, the reference absorption cross sections (185–235 nm) of SO2, NO and NO2 at high temperature are calculated by applying the Voigt broadening method to the original absorption cross sections at low temperature. The influences of temperature, pressure and instrument function are taken into account in the calculation. A validation study of SO2 and NO measurement is performed by comparing with the results measured by a non-dispersive infrared analyzer. The result shows that they are in good agreement with each other indicating that the DOAS technique has a potential application to industrial gas pollutant emissions measurement.