The pollution characteristics and influence factors of atmospheric particulate matters were analyzed based on PM2.5&PM10 mass concentration and meteorological data during 2013/12—2014/11 in Nanjing. Results showed that annual average of PM2.5 and PM10 were 0.0820 mg/m3 and 0.1333 mg/m3. Seasonal differences were significant, it showed the following trend Winter> Spring> Autumn> Summer. The daily variation of particulate matter presented the ‘Bimodal Dual Valley type’, two peaks were found nearly at 11:00 and 23:00, and valleys were close to 7:00 and 18:00. Between particulate matter and the temperature, the relative humidity, and the wind were negatively correlated, but the visibility and the pressure were positive correlated. These meteorological factors affected the concentration of particulate matter and air pollution levels together.