Based on the observational data of Nanchang from 1960 to 2006

climatic characteristics and forming cause of haze in Nanchang are analyzed. The results indicate that the most haze days in Nanchang are in December and the fewest days in July

and the haze days in autumn and winter account for more than 75 percent of annual total haze days. In general

the number of annual haze days represent the obvious increasing trend

especially increasing rapidly after the 1980s. Inter-annual change of haze days is associated with the development of urbanization and pollutant concentration in the atmosphere

while the seasonal and monthly variations of haze days are mainly influenced by synoptic situation and weather conditions. Haze could decrease global solar radiation.