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The continuous field measurement of some trace gases on the surface air was conducted at Shangdianzi Regional Background Station (117°07′E，40°39′N，293.9 m a.s.l.) in Beijing from September 2003 to February 2004. Some variation characteristics, variation regularity and the present concentrations of O3, NO, NO2, NOx, SO2 and CO were obtained. Primary study shows that the concentrations of O3, NO, NO2, NOx, SO2, CO showed diurnal variation and monthly variation. In general, the ozone concentration was higher in autumn and lower in winter. The relationships between O3, NO, NO2, NOx, SO2, CO and meteorolo gical factors are discussed. Ozone is negatively correlated with NO, NO2, SO2 and CO. There is a good correlation between CO and NOx, SO2. It can be observed that the trends of concentration variations of gaseous pollutants in Shangdianzi are similar to those in the Beijing urban area.