Abstract: Based on the theory and method of Environmental Economy,the author estimates the effect from soil erosion,and calculate the effect into currency to be compared with main economic items in the areas to reflect the degree of soil and water losses.The total loss for soil erosion in currency is 622 million RMB in 2002,which occupies 4.96% of the agricultural productive value.Among them,the nutrition loss estimated to be 550 million RMB,occupies 88.45% of the total loss for soil erosion in currency.Soil erosion results in bad land productivity.The most severe areas are Nanbu county,Langzhong City of Nanchong,needing to be emphasized for governing.