Abstract: Rainwater acidification in Qingdao area can represent that in northern area of China to a certain degree. The current situation and tendency of acid deposition in Qingdao area were emphatically analyzed after a large number of data were obtained through long term conventional observation and short term comprehensive observation for distribution of rainwater acidity in time and space, and the relation between acid rain and meteorological condition. The results show that rainwater acidity frequency in Qingdao area are related to the environmental concentration of SO₂, i.e., rainwater acidity and frequency are high in downtown where SO₂ concentration is high, lower in suburbs , and lowest in outer suburbs; seasonal variation of rainwater acidity is obvious, i.e., high in winter and spring, low in summer and autumn; the tendency of acid rain is controlled by emission of SO₂.