Data of pollutant concentrations from November 1, 2013 to December 12, 2014 were collected from China National Environmental Monitoring Centre and employed to analyze the variation of pollutant concentrations in Beijing-Tianjin-Hebei region during APEC summit, 2011. The result shows that the annual mean concentrations of PM2.5, PM10, SO2, NO2 and CO are 95.3, 163.9, 54.7, 48.9 μg/m3, 1.5 mg/m3, respectively. Concentrations of these five kinds of pollutants are highest in winter and the lowest in summer, while different pollutant has different monthly distribution. During APEC summit, average concentrations of PM2.5, PM10, SO2, NO2 and CO are 66.1, 123.7, 33.2, 48.5 μg/m3, 1.2 mg/m3, respectively. The concentrations of PM2.5 during APEC summit account for 60.1% and 59.4% before and after APEC summit, respectively. The concentrations of CO, NO2 and SO2 during APEC summit are nearly the same as the concentrations before APEC summit, but increase significantly after APEC summit. Owing to the strict emission control, the concentrations of PM2.5, PM10, CO and NO2 in Beijing-Tianjin-Hebei region decrease by 40%, 35%, 15% and 10%, respectively.