The indicators are analyzed for the samples taken from 6 typical soil profiles, including Ah and AB horizons on the eastern vertical spectrum of soil in Mt. Hengshan. The results show:1) In the past 20 years, these soils developed on weathering materials of granite have experienced different levels of acidification, which is recognized by such indicators as increase in exchangeable acid, especially exchangeable Al³⁺ as well as decrease in pH, total of exchangeable base, base saturation percentage, and especially soil acid-buffer ability and soil acid-damage capacity. 2) By contrast, acidification is more evident for the perudic luvisol at the top of the mountain and the udic ferrisol at the foot of the mountain while the process of acidification is slow for the perrudic ferrisol on the slopes of the mountain and slower for the perudic cambisol at the upper part of the mountain, suggesting that soil acidification is related not only to the amount of acid precipitation to soil but also type of the soil.