The characteristics of acid leaching of brown soil and cinnamon soil were studied using an indoor soil column leaching method with simulated acid rain. The results show that acid rain with low pH can badly acidify brown soil

and activated Al can be detected in the leacheate

but comparatively the effects to cinnamon soil on pH are not obvious. Significant correlation between the total amount of four kinds of base ions in the leacheate and concentration of H of acid rain is evident. The amount of cation loss can be shown in the order of: Ca 2 >Mg 2 >Na >K . Among these

Na is the least sensitive to acid rain. The changes in EC have the same pattern as that of leaching loss of base ions. But the changes in EC among different treatments are larger than those of leaching loss of base ions. The order of four kinds of acid rain damaging to the soils is: pH2> pH3> pH4

pH5. The resulting degree of damage to brown soil was higher than that to cinnamon soil.