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The data from the air quality auto monitoring system in main urban area of Beijing were used to analyze the concentrations and relationship of six pollutants including gaseous pollutants O3, CO, SO2, NO2 and particulates PM10, PM2.5 in the spring of 2013. During this time gaseous pollutants caused little pollution and was acceptable. The particulates caused more pollution to ambient air quality especially in PM2.5 and their concentrations were far above the annual mean value of Chinese standard. The concentrations of PM10 and PM2.5 had similar variation trend and their correlation was significant particularly. AQI showed long-term situation in slight pollution in the spring of Beijing with PM2.5, and residents gathered pollution was still more serious.