Abstract: The spatial and temporal distribution characteristics and variation regularity of mass concentration of aerosol and water soluble ionic concentration for the samples collected at Waliguanshan Mt. baseline station (36°17′N, 100°54′E, 3816 m SLE); Longfengshan Mt. (44°44′N, 127°36′E, 331 m SLE) and Lin’an (38°18′N, 119°44′E, 131 m SLE) regional background stations in autumn (October 1994) and winter (January 1995) were analyzed. The preliminary conclusion was drawn as follows: the highest values of mass concentration of aerosol and water soluble ionic concentration were observed at Lin’an, the middle at Longfengshan Mt. and the lowest at Waliguanshan Mt.; the mass concentrations of aerosol were higher in autumn than in winter at all the three stations. In addition, the impacts of winds and some trace gases on the concentration distribution characteristics of aerosol were also discussed.