For a long time it caused soil erosion serious relatively and the peoplein Guyuan County with quite low living level for the increasing population,rare plantation,poor soil and shortage of a Three Materials ". Having beenadjusted during 1983 to 1985 in Guyuan County for the rational land usestructure, the region is now with a higher productivity,an increased grainoutput and soil loss reduced greatly, the net income of the mass there hasbeen increased for two times. In accordance with the comprehensive work,the ratio for optimized structure of land use of farming, forestry andhusbandry is determined as 1:1:3. The key step to establish a soundagroecological model is to develop an available and efficient ecologicaleconomic structure of farming, forestry and husbandry.But if the soilconservation is performed only for soil conservation,it is impossible to solvethe problem as a whole.