The ecotone between agriculture and pasture in the dry-semidry area in North China is vulnerable in both ecology and economic. Under the traditional concept of the productivity which caused the neglecting eco-system productivity is the main reason that the environment and economic deteriorated. The development of the eco-system productivity was discussed based on the eco-system productivity conceptual in this paper. Sweet sorghum (Sorghum bicolor), millet TG118 (setaria italica beauv), maize (zea...