Abstract: Abstract: 【Objective】The succession and enhancement mechanism of the ecosystem productivity with the characteristics as de-farming in the ecotone between agriculture and animal husbandry of North China was discussed, in order to offer a way or technical basis for maintaining the permanent impetus of ecological recovery and economy development of the region. 【Method】Cases study in combining with theoretical analysis was adopted. 【Result】 In the regioin, after de-farming the biomass productivity of de-farming subsystem decreased by 38.4%~72.3% as compared with that of farming subsystem in the ecosystem, the main function of de-farming ecosystem should be focused on social resource-environment productivity, it caused the ideally beneficial recycling that was “de-farming-planting grass-raising animals-grain money” difficult to be realized. With the de-farming subsystem differentiation, the natural and social resources in the farming subsystem were accumulated, it laid basis for starting to upgrade the new characteristic of economic productivity. Case study showed that the system economic productivity was increased by 8.85~13.35 times due to re-coupling of the de-farming subsystem and farming subsystem, as well as coupling of crop production in the combined subsystems where existed the created microhabitat differentiation of water and fertilization that were the main concepts of the differentiation in the same field. 【Conclusion】 Structure rebuilding and opening operation of the de-farming ecosystem, playing the advantage of complementary co-operative production among different regions under conditions of the market economy, and rebuilding opening agricultural production structure were the important mechanism to enhance the system productivity in the ecotone between agronomy and animal husbandry of North China.

Key words: Ecosystem after de-farming, Biomass productivity, Economic productivity, Resource and environment, the ecotone between agriculture and animal husbandry of North China