By taking Huangzhong County,Qinghai Province as a target area,a survey for the influence of socio-economic factors on the considerations of farmers for the cropland conversion program was carried out using grey related analysis as the main method.Results show that farmers' enthusiasm for converting cropland into forest or grass land is directly influenced by increased income and compositions of income.The implementation of cropland conversion into forest or grass Land is influenced by the age and educational background of householders and their families.