The interaction between NOM and minerals strongly affects the preservation and dynamic process of soil organic matter and other ecological processes.The study of the preservation and loss of the organic matter in soil is hence of great importance in environmental protection. Researches on the effect of simulated acid rain action indicate that, with the increasing soaking time, the gross content of iron and aluminum residues in red soil decreases, and aluminum is eroded and dissolved more significantly. Moreover, the morphological change of Fe/Al-oxide minerals in red soils finds expression in the fact that the crystalline Fe/Al_oxide minerals are dissolved remarkably, while the amorphous species of iron and aluminum and/or their complexes species change insignificantly or even increase to some extent. The soil organic matter(SOM) is dissolved notably under the condition of acidic pH,it suggests that the dissolution of the free species of Fe/Al_oxide minerals play a key role, and the hydrolysis of the SOM maybe occurs also. In addition, the SEM analysis shows that the action of simulated acid rain might cause the breakdown of the structure of soil aggregates.