Abstract: Water sample collected periodically, by means of lysimeters. from soils under Chinese fir, loblolly pine and deciduous oak were analysed. It was shown that the concentrations of various ions in percolating water collected from May to June were much higher than these from July to August in general, and their patterns of distribution along soil depth varied with sampling dates. The ion concentrations in soil Percolating water and their distribution Patterns under Chinese fir and oak stands were alike except for slight differences, but different from those under loblolly pine stand. From May to June the leaching intensities of various ions under Chinese fir stand were the strongest, those under oak stand ranked second, and those under loblolly pine sland were the weakest; whereas from July to August oak stand ranked first, Chinese fir stand the second, and loblolly pine stand still the weakest. The annual amounts of nutrients leaching downwards by soil Percolating water corresponded to about 1～10% of nutrient amounts returned from litterfall, among them the ratio of leaching loss to return amount under Chinese fir stand was the highest.