Character of agro-ecolonomic system and its sustainable development countermeasures in Huangta small watershed

The structure，function and relationships with the outside of agro-ecolonomic system in Huangta small watershed is revealed by system theory，and some management measures are suggested such as fully using land，adjusting structure of product；raising grain yield and output value of unit land：enhancing the infrastructure construction；strengthening training of technical ability of agriculture