Taking the evolution of eco-environment in Datian county as a lead, some scientific and technical problems related to soil erosion control and ecological agriculture construction are discussed. the law of evolution of agricultural eco-environment is expounded. The satus and properties of agriculture eco-environment are fully analysed, and the key problems of agriculture environment construction are discussed. To attain the goal of system engineering construction of eco-environment, the feasible countermeasures according to the specific condition of Datian county are put forward.