The dry-farming lands in loess plateau is closely related to the ecological security, economic development and "issue of agriculture, rural areas and peasants" in China. A wide range of scientific research achievements are accumulated about the new countryside construction in the dry-farming lands in loess plateau, but have little effect because of unsystematic integration and promotion. To resolve the problem, the article proposes three key technology systems. 1) The technology system of modern rainwater harvesting agriculture and agricultural leading industries based on optimizing water resources. Optimizing water resources allocation is the core issue in dry-farming technology. One is modern rainwater harvesting agrotechnique, while another is the agriculture-leading industrial technology including the apple-planting, and facility agriculture. The aims of the technology system are to maximize the improvement of the efficiency of resource use in agriculture. 2) The technology system of rural eco-green community planning and construction based on analyzing various type of rural areas. The dry-farming lands in loess plateau has complex and diverse topography and highly dispersed rural settlements, which including three typical rural communities-hill-gully, small watershed-kawamichi and dry plateau area. Based on analyzing the characteristics and common problems of three categories rural communities, different types of ecological community planning and construction suitability models are put forward. 3) The system of rural environment management and renewable energy use based on circular agriculture pattern. Based on farmers' land resources using, powered by solar and linked to high-efficient biogas digester, the mode will form a complete set of favorable cycle system.