The "Pig-Raising,Methane-Generating and Fruit-Growing" eco-agricultural system is a pattern of recycling economy.The system structure and work mechanism are analyzed and results of scientific experiment are summarized for the development of recycling economy in this paper.The system integrates a series of complex biological and chemical reactive process based on the methane-generating.This leads to simultaneous accomplishment of upgrading structural hierarchy for traditional cultivation pattern,making full use of material in multiple hierarchies,making effective conversion of energy,and bringing economic,social and ecological benefits.Some 103.87 million methanegenerating pits and 250 big methane-generating projects have been constructed in Jiangxi Province.Because firewood gathering has been replaced by methane,more than 6×106 m3 of woods are saved every year,and 74×103 ha of forest has been projected.The residues in methane-generating can be returned to farmland,so that fertilizer use efficiency increased by 20% in contrast to the traditional pattern and the soil quality can be improved,for example the organic materials increased by three times and the dissolve nitrogen increased by more than one times.The "Pig-Raising,Methane-Generating and Fruit-Growing" eco-agricultural system has been widely used in tackling small catchment in a comprehensive way,reducing environmental pollution by area source in rural areas,predicting the pollution-free foods and controlling schistosomiais.The results of the theoretical research and scientific experiment show that development of recycling economy should maintain the direction in the theory and methodology of the system science,take the motive force of science and technology as a guidence and laws and policies as a support.