The process of Chinese urbanization and industrialization is accelerating rapidly with the reform and open to the outside world policy, which resulted in a huge consumption of the land. But the disorder and inefficient land development policy now has brought about negative effects, which being a menace to the sustainable development of the country, threaten the ecological security, food security and social stability. The above things are mainly about our current land management model. Since the founding of the people's Republic of China, the urban land management agencies and their functions are changing constantly under the planned economy which leaded to a single administrative leadership land management model. Recently, some scholars, experts and officials presented that: our land management model should be changed from resource management to assets management. Some researchers pointed out that the three main methods of American city land management should be adopted: administrative districts, the market mechanism and planning and the city land reserve and transfer system. The traditional land management systems focus on the quantity of the land, but the function being neglected, what's more, administrative intervention too much and lack of market mechanism which leaded to the divorce between land management and economic, ecological. Which resulted in some problems in our land management, like weighs quantity lights quality, weighs structure lights functions, weighs results lights processes, weights physical form lights ecological, weights interception lights regulation. The ecological essence of above things lead to landscape fragmentation, soil compaction, pollution retention, ecological depletion, short sighted behavior and poor information. The crux of the land management problem is the unbalance between the needs of society-economy and the ecological carrying capacity of the regional area; the paradox between the natural ecological footprint and the ecological services of green space; the uncoordinated management relationship between urban and suburban areas, agriculture and industry, the built up area and non-built up area. And, the development behavior is mainly mass investment from external mandatory and the dominant enlarge model is export-oriented land development, which lead to the weakness of internal self-organization and regulating function.
According to these problems mentioned above, the article proposed a conjugate ecological management model for urban land administration based on the land complex ecological function, which divided the land function into four categories: biomass production function, support for land construction, provide security for farmer subsistence and the other functions (like water conservation, soil conservation, climatic regulation and so on). Then three ways of mechanism transformation were put forward: the land management systems should altered from single-attribute and simple target to multi-attribute and multi-target; changing into market mechanism from administrative management; giving priority to the regulation and management system based upon land ecological function. Then, we concluded that the conjugate ecological management model should comprise the following five aspects: 1) changing from the resource management of the land plane structure to the ecological management of the land stereo space; 2) keeping requisition-compensation balance within the development area according to the ecological function, but not in terms of land area which in different locations; 3) the land development should in accordance with the structure and function optimization followed a sugar-coated berry string type, but not expands like standing pancake. 4) altering from the most strict land quantity management to the most reasonable land function management, and taking the land ecological-economic function monitoring and audit into practice. Finally, a typical ecological engineering was being analyzed, which proved that the social, economic and environmental complex ecological effects were more than the traditional land use model.