Good soil physical environment is a fundamental for gaining stable and high yields of crops. The return way of organic materials was controlled artificially in the present study. Recults from the nine-year filed location study show that in the case of continuous application of inorganic fertilizers, especially mono-application of inorganic fertilizers, in paddy soil from red soil, the soil structure was damaged, soil became more compact, the filth of soil became worse, the plowpan rose, and the land productivity declined as a result of decrease in the inorganic and organic colloids.