In karst regions in northwest Guangxi,new open the paddy field to operated the empress of 4 year to seep into the coefficient have been an old fields of 1.36~1.45 times,leaking leak the nutriment in a fertilizer to still and very operate the cost gain seriously,and if have increased to operate the inside's plough rake the number of times,and could accelerate the formation of the plough first floor,and have reduced to seep into.Speak from input output,new open the paddy field to have planted the drought to make(soybean or dry rice ) the first 2 years,3 years start have planted the paddy rice,since could validate to lower new open the fields leaking,and again could reduce to operate the cost,and could acquire the very economic performance.