Based on meteorological data from 2000 to 2014 and environmental monitoring data from 2013 to 2014 in Zhongshan, the haze characteristics and meteorological factors were analyzed. The result showed that haze days had obvious annual variability, there were 11 haze days in 2005 and 134 days in 2008. Haze in Zhongshan mainly occurred in autumn and winter. From 2000 to 2014, the average of haze days was 10.5 days in January, which was the most frequent month of haze pollution. PM_2.5 was one of the most important pollutants causing haze. When haze occurred, the average concentration of PM_2.5 was 2.26 times higher than non-haze days. The typical synoptic patterns associated with haze over South China could be summarized into 7major categories: mainland high pressure, ridge on South China Sea, equalizing pressure, foreside of cold front, downward flow of typhoon periphery, foreside of trough or backside of ridge, and trough over South China. The type of mainland high pressure caused the most haze days, taking up by 52.03%, while the type of foreside of cold front caused the lowest visibility. By using cluster analysis, the results revealed that airflow transport channels near the ground in Zhongshan could be divided into 7types. The mainly transport channels were from the northeast China and coastal areas in the East. The northeast channels could cause high pollutant concentration, and the east channels could cause low visibility. The result demonstrated that haze in Zhongshan was noticeably affected by regional airflow transport.