怀安县从1983年列为全国水土保持重点治理县后，在上级有关部门的指导下，从实际出发，以小流域为单元，山、水、田、林、路全面规划，综合治理，重点开发建设黄土丘陵侵蚀区，收到了显著效果。11年来，全县共完成综合治理面积630km2，占应治理面积的39．4％，其中造林4万hm2， Huai’an County, listed as a key county in soil and water conservation since 1983, under the guidance of the relevant departments at a higher level, takes the small watershed as a unit and plans, comprehensively manages and focuses on the development of mountains, water, fields, forests and roads under the guidance of relevant departments at a higher level The construction of loess hill erosion area, received a significant effect. In the past 11 years, the county has completed a comprehensive management of an area of ​​630km2, accounting for 39.4% of the area to be managed, of which 40,000 hectares are afforestation,