Before harnessing the Sanmeng River watershed is characterized withvegetation damaged, a large amount of soil and water lost, the farmlandlost of water, soil and fertility, tillage layer becoming thinner and thinner, productivity gone down and lower ability to fight against drought.Also, river bed is raised and deposited greatly, large area of lower lyingfield created, which reduce the benefits. The harness measures adopted are as these: 1、to regulate the structure and distrbution of forestry,to expand vegetation; 2、to persist in the steep land returned from tillage to forest and husbandry, and reclamation not to be permitted; 3、to develop economic forest for the increase of commodity products based on the superiority of the lower hill or gentle slope. The result is thatthe cover rate of forest is increased from 38% to 56.5%, the cubic meter amount stored of the standing trees from 18,000m³ to 59,00 m³,being2.3 tims in increase,the net income from them is 6.21 million yuan, andaccumulated ratio of output to input 17.22.