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Based on the differential optical absorption spectroscopy(DOAS) system in Nanjing University of Information Science and Technology, O3, NO2 and SO2 of the north suburban area of Nanjing from January to November 2008 were measured.The characteristics of atmospheric pollutant concentrations and diurnal variation and monthly variation and weekend effect were analyzed.The observational hourly frequency concentration spectrums showed that the frequency peaks were in the range of 50-60 μg/m3 for O3, 20-30μg/m3 for SO2 and 30-40μg/m3 for NO2.