Taking Puwa watershed located at southwestern
mountainous area in Beijing as a case, this paper systematically analyzes impact
of smart land use in small watershed management on Eco-economic systems of slope-land in
mountainous area, and methods of Contrast, AHP, Fuzzy Comprehensive Evaluation based on field survey and collection of land resources, eco-environment, social and economic data of the watershed are used in this research. A demonstration area is selected to test the measures of wise land use and their impact on
Eco-economic system. The contrast study shows that, through readjustment of land use pattern from 1∶13∶5 to 1∶6∶5.1 of agriculture, forestry and pasture, land use efficiency rises from 50.4% to 97.7% and the soil erosion per square kilometer per year drop down from 905 t to 226 t. In the period of small watershed management, soil and water erosion has lessened 86.9%, with the surface runoff has lowered from 8.534 million m~3 to 5.425 million m~3, a 34.63% drop, and (26 500) tons of sediment drops on the year base. The income per capita comes from agriculture, forestry and pasture rose to 730 Yuan in 1996, a 110.37% increase from 347 Yuan in 1990. The total income of the small watershed has jumped to 57.083 million Yuan in 1996, 8.4 times than that of in 1990. In general, after nearly 5 years of comprehensive watershed management based on optimal use of land resources, soil erosion was almost controlled, sediment amount from surface runoff lessened significantly, land productive efficiency dramatically raised, farmer's income increased, resisting capacity of agricultural system to natural disasters reinforced and the stable and sustainable development of the Eco-economic systems of small watershed witnessed simultaneously. It suggests that rational use of land resources and readjustment or restructuring of land use patterns be a good way to consolidate small watersheds in the respect of eco-economic system development.