Soil and water conservation at county level is characterized by the extensive project management, tremendous construction projects, dispersed locations, and various document types.In the meantime, the 3S technologies have applied to soil and water conservation, gradually and widely.Accordingly, the GIS based management information system on soil and water conservation at count y level is analyzed and designed.Sys- tem needs and target, fundamental techniques and functions, and initial operation are outlined.The management system function struct ure is discussed, including assistant plan design, dynamic data management, wa- tershed management, document management, and thematic map management, as well as such functions as inquiry, statistics, and report form.It will not only provide a scientific means for project management of ecological construction, but also bring forward a new pattern for the construction of management information system on soil and water conservation at county level.