Soil and water losses of steep slope cropland are serious problems on both eco-environment and sustainable agricultural development.

Based on the principle of gradualy control, different level classification, all covering and main factors, the steep cultivated land for quitting was classified to 6 site type areas by macrolandforms, 5 site type subareas by rock group characteristic, 2 type groups by gradient, and 3 types by soil layer thickness in noncarbonatite areas, 4 site types by soil continuity in karst areas.

Sustainable development of the society and economy has inevitably been restricted in the region,so that the de farming and afforestation in the steep cropland become far more significant for the development of the society and economy there.

On the bases of dry sloping fields structure and its damages, the countermeasures of conversion from farmland to forest in steep slop land are pointed out on sustainable development, that is to program the plan of conversion of farmland to forest and using; to use the steep slop land reasonably of conversion f.

Study of the ultimate capacity of embankments on mountain steep slope foundation;