| In China in the household contract responsibility system peasant cooperative association and new family farm are brought forth continuously. In breeding family breeding and middle and small scale breeding professionals are pig breeding subject. But waste pollution from scale breeding is not ignored to agriculture eco-system, even low carbon and eco-agriculture development. Government biogas engineering investment efficiently restrain pig feces and pee etc waste pollution. But methane and biogas second pollution become serious. From 2002, Nanchang University System Engineering Research Institute and management science and engineering doctor station hang out and bulid a Nanchang University eco-energy system engineering Research and Teaching Base in Taihua Scale breeding zone in Jiangxi province pingxiang city. We established methane diffluence, delay filter, oxygen storage, five breeding and planting biological chain comprehensive utility highly effect low carbon eco-economic agriculture biomass energy industry system. Achivements of scale breeding and planting eco-energy system engineering research and application in hills got first science and technology advance prize in Pingxiang city, social first prize in Jiangxi province, second science and technology advance prize in Jiangxi province. The task of scale pig husbandry pollution controll and recycle utility integtation and application by Jiangxi province government by Science and Technology Department is 1 million yuan from 2008 to 2011. there are three scale breeding and planting low carbon eco-energy economiv establishment sample base from north to south in Jiangxi province in National Poyang lake Eco-economic Zone. One of three is Jiangxi province Debang husbandry Co. company low carbon eco-energy economic sample base, which breeds 20 thousands breeding pigs in a year. Nanchang University management science and engineering department doctor station integrates closely base construction and doctor dissertation. The dissertation is based on now research basis, looked Debang breeding and planting eco-energy zone in Jiangxi province as an important example. On the background of household contract responsibility system, the farmers' income, the resource utilization of farming feces and pee, peasant biogas and plant company and paddy planting are included Debang eco-economic zone to realize three goals of the beauty environment, economic development and peasant biogas. With the SD feedback complexity analysis theory and approaches, a series of management strategies for eliminating pig pee accumulation pollution and biogas unstable, the engineering for implementing the strategies are also designed, which will ensure the aim of economy development and the environment in farming areas to be protected.1. First part is combined feedback archetype analysis with economic comparative advantage theory, research the present situation and tendency of the household contract responsibility system, illustrated that new family farm is a future access.This dissertation presents new family farm is the tendency of the household contract responsibility system. Through the case of Jiangxi Province, Pingxiang City, LuXi County baboo Special Farmers' Cooperation Chen Maosheng grew 500 acre rice in 2008, this article compares family farm on a scaled operation mode with the household contract responsibility system based on detail data and comparative advantage theory in economics. Based on the data of 1978-2007 Pingxiang City agriculture development, the paper analyzes the four merits of the household contract responsibility system, indicates four increasing limits of developing process, enumerates seven viewpoints of the tendency.2. Second part analyzes in depth real development, bulids five Vertex Weighted Causal Diagrams, proves three management policies by many vertex value dynamic change law of five vertex weighted diagrams. By dynamics we illustrates that three management polices by elliminating negative feedback loop in vertex Weighted Causal Diagrams and promoting two positive feedback loop are right. In the household contract responsibility system, it carry out breeding and planting and company and household methane biogas engineering together, to develop scale husbandry eco-economic industry.Debang Pig Farming eco-economics zone with the scale livestock breeding is an industrial zone for Poyang lake eco-economics zone planning of national strategy. It is a circular economic development zone to be realized scale livestock breeding and scale planting. It is also a low carbon and eco-industrial zone of biogas energy for decreasing pollutant discharge (energy saving and emission reduction) and an innovation base built up by the cooperation of university, company, farmer, local government etc. This kind of circulation system with farming scale and planting scale and energy saving and emission reduction is a complex system. To study this system, Nanchang University created a Three-Steps Vertex Weighted Causal Diagram Dynamics Analysis Method. First, this paper analyzes in depth real development and determines core variable causal chain set of system development. It results in profit growth positive feedback loop of scale pig farming with the scale made of three positive causal chain and pig feces resources exploitation growth positive feedback loop made of four positive causal chain, which brings to light advantage of system development. At the same time the paper brings up a pig pee pollution restriction negative feedback loop of three positve causal chains and one negative causal chain which reveals the problem of system development. Secondly, Nanchang universty tests and calculates feces and pee and nitrogen, phosphorum, potassium of feces and pee of 17 kinds of pigs each month from 2005 to 2009. we get per pig profit formulation of each pig profit of small pig, breeding pig and pig. It builds growth and confine vertex weighted diagram made of two growth positive feedback loops and one confine positive feedback loop. It quantificationally reveals advantages and disadvantages of system development. Last, by connote of two growth positive feedback loops and one confine positive feedback loop, the paper brings up sustainable development management of circulation system of farming scale and planting scale and energy saving and emission reduction. By vertex value change law of five vertex weighted diagrams it proves the result of three management policies which are to bulid biogas project of bio-energy environment protection, to carry out breeding and planting and company and household methane together, to increase investment with scale in eco-economic zone. The three management policies have carried out in pig farm zone and promoted eco-economic development. The three-steps vertex weighted diagram analysis method and research are of important theory and practical significance and give the accumulation for establishing quantitificationally simulation formulation.3. Based on five vertex Weighted Causal Diagrams vertex value, we bulid the simulation equation and rate variable fundamental in-tree and simulates the system behavior variation caused by the impletation of three management strategies in future ten years and prove the right of strategies in the household family contract responsibility system.In accordance with system qualitative analysis by the vertex weighted causal diagram variable and vertex value, we divided the system into seven sub systems; which are pig slaughter, month livestock, scale breeding year profit, year pig pee, farm pee biogas, year pig feces, Peasant pig feces year biogas. For each subsystem, there is a corresponding in-tree; the total in-trees construct the rate variable fundamental in-tree model of Debang scale production ecosystem. The in-tree model is composed of seven rate variables fundamental in-trees. The root of a rate variable fundamental in-tree is a rate variable, the level variables or other rate variables, external variables, constants(parameters) which control the root only through auxiliary variables is called the leaves of the in-tree.Based on the simulation equation of three-step vertex Weighted Causal Diagrams vertex value simlation model, simulates three managemet strategies of biogas comprehensive utilization, scale breeding and pig feces utility in 2005-2020 and qualitatively proves the right of strategies. The simulation shows that biogas comprehensive engineering of pig feces and pee promtes the recyle economic benefit for scale breeding and protects the environment for sustainable development.4. Research on the solutions and effect. Forth part illustrates expatiates a model project of ex-perimental comprehensive utilization of biogas and biogas residue developed by Institute Of System Engineering of Nanchang University collaborating with Debang Husbandry Farm, mainly concerning the technological flow and effect of farming and university biogas energy exploited and methane liquid comprehensive utility engineering for pollution. The engineering operates effect.Taking the pig farm, cropland, fish feed, chestnut and plantlet in the small river watershed as an eco-economic system a Project to treat the pollution caused by the anaerobic digester efluent of Piggery wastewater was designed, it includes five sub-projects, which were the three times deposition & deconta, Ination project, the difluen tirigation'pig-biogas-paddy', the winter unused cropland development project and the country'pig-biogas-vegetable, pig-biogas-sweet potato, pig-biogas-fish feed, pig-biogas-plantlet' project. By implementing this systematic project, The farmers' income growth, safety of food supplies, winter unused cropland development, save the cost of managing pollution, supplying stable biogas in winter, recycling economy of planting and breeding industry and environment cleaning were ensured in the small river watershed.
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