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Based on Black Carbon aerosol (BC) observations in Urumqi atmospheric composition observatory station from December of 2009 to February of 2010,as well as the PM observations and the BC result of other areas,the Black Carbon aerosol (BC) variation characters and effect factor were studied.The result shows that the daily average concentration of BC was 12.442±5.407μg·m-3 with the range 2.685~26.691μg·m-3 in winter in Urumqi.