Soil and water loss is one of the most serious environmental problems. It is important to monitor soil and water loss in karst region because of the fragility of its eco-environment.The applied status of methods for soil and water loss monitoring in karst region is summarized after studies of water balance and energy balance in different regions and different ecosystems.It is presented that the balance between substance and energy is the new subject of soil and water loss monitoring in karst region.Accordingly,primary field observations in Guizhou karst region were made,which provide soil and water conservation with a new thought and a method.