Abstract: Based on the observations of the acid rain network of China Meteorological Administration (CMA) from 1993 to 2007, after carefully contrast analysis, this paper draws the following three conclusions: firstly, the area of acid rain regions south of the Yangtze River in 2007 remained virtually unchanged in comparison with the past, while the intensity of acid rain in some stations reached a peak value; secondly, the rain acidity in northern China, especially in North China, increased markedly, and the frequencies of acid rain and severe acid rain in some of the stations in 2007 reached the maximum; thirdly, the average acid rain days and the ratio of acid rainfall to the total precipitation drastically increased year by year from 2004 to 2007. The average acid rain days in 2007 was the highest in the past 15 years, when the systemically observation data were available.

Key words: China, the year 2007, acid rain, characteristic