| As a natural resource, land existed far from the origin of globe 46,000 million years ago, then land use generated gradually by the appearance of animal, but actually speaking, the conscious conduct of land use come out since human evolved from ape 6.5 million years ago, it can be considered as an purposefully social-economy activity during human history, and interacted with human conducts, gradually the huge land use system shaped, which refers to all the aspects of society, economy and nature.So far, the land use system has experienced a long and complicated history. Back in primitive society period, while the productivity is pretty poor and the human society depends on natural environment absolutely. This is the initial period of land use system that it indicates a coordination of a primitive state of symbiosis; After entering the civilization, land use system changes a lot, the role of human plays in the system changes from environmental consumer to transformer, which promotes the land use system to a state of transformation; At the initial period of industrial time, the way of land use changes into destroyed conquest, conflict between resource-environment and social-economy occurs in land use system; then in the middle-industrialization, with the advance of science and technology, people begin to control, adjust and delay the resource and environment problems which are spreading more and more, so the state of land use system turns to a new coordination; In the middle of 19'th century, the late industrialization, with the rapid development of industrialization and urbanization, trend of non-agricultural land use is aggravating, which results in severe ecology problems in land use and makes the system run disordered; When the post-industrialization period marked by information reform comes, more concern is focuses on sustainable land use, and then the land use system turns to the state of another coordination of sustainable development.Therefore, we can see that the development of land use system counts for the existence and development of human, if the land use system tends fine, then the whole society's production and life can be prompted positively; On the contrary, a deteriorated land use system can surely lead to a worse environment and thus a poor life for human. Therefore, it is terrifically necessary to carry a research on evolution of land use system, through which we can understand the rules of its running, and then control its development rationally for the purpose of benign operation of land use system and make due contribution to human society.Based on the above consideration, this paper, supported by theories of system science, sustainable development, man-land relationship and land eco-economy, adopts research methods such as normative & demonstration research, qualitative & quantitative analysis, and static & dynamic analysis etc., implements research on evolution analysis and state evaluation of land use system, it concerns the mainly contents as follows: (1) Research on features and operation principles of land use system. Through comparison of features in general system, the paper analyses special structure and function of land use system;Then it make clear the evolution goals of land use system as to realize rational allocation and value increase of land use, keep a nice operation and build a harmony relationship in the system. In order to realize the goals, principles that should be obeyed in land use system needed to be study; (2) Review of the evolution history in land use system. Firstly, a general analysis is carried on the whole system, and then, a specific description is given on evolutions of all the sub-systems of nature, society and economy; (3) Analysis of evolution in land use system. Based on theories of entropy, self-organization and hetero-organization, an evaluation model of disordered degree of land use system is built, which is used to assess the evolution direction of land use system; Then paper gives a new classification on driving-force factors of land use system, and by means of several statistic methods such as principle components and grey correlation, it analyses driving-force mechanism in evolution of land use system; (4) State assessment of land use system. Though an establishment of assessing indicators, paper firstly evaluates the capacity of land use system, then according to the former assessment of disordered degree of land use system, a conclusion of state assessment in land use system can be put forward; (5) Control manmagement of land use system. Based on principles of system control, paper discusses the connotation, goals, mechanism and mainly means during land use system's control, and emphasizes the role of land use planning on its control; (6) Finally, paper makes a case study in Yangzhou city though the theoretic frame above, and some conclusions are drew out as follows:Firstly, land use system is complicatedly-coupled, it's essential objective is to realize an odered evolution in land use system. Under guild of the very goals, the system runs follow principles of wholly-emergency, synergy, and dissipative structure features.Secondly, land use system tends towards a direction that is more and more ordered after the longtime evolution. While in the analysis of driving force in change of land use system, we can see that hetero-organization plays an important role. Taking Yangzhou city as an example, result shows that the entropy value of land use system reduces to 0.899 in 2004 from 1.306 in 1996, totally declines 0.407, which indicates the evolution of land use system in Yangzhou city runs sustainably. From the driving force analysis, we can find the hetero-organization factors such as population, economic growth, urbanization and policy have a good influence in pushing forwards the evolution of land use system in Yangzhou city.Thirdly, system state is quite different during different phases in evolution history of land use system, but generally speaking, the system state is tending more steady. Assessment on capacity of land use system in Yangzhou city indicates that its value tends steady and some climbing between 1996 and 2004, the capacity value increases to 1.4057 in 2004 from 0.7869 in 1996, averagely adds 0.069 per year, showing a nice trend in its development. Above it we can assess the state of land use system whether it is steady or not, although there are some periods the state is not steady much, on the whole, system state is tending well.Finally, Though the analysis of control management in land use system by means of planning, we can see that land use structure is the key in planning control, and arable land and construction land are the mainly objects to control. Taking a comparison in present, forecast and planning structure of land use, it is obviously shows that the outstanding conflict between forecast structure and planning structure focuses on arable land, garden land, residential and industrial land. According to demand of social-economic development and requirement of land use planning, two goals can be ensured during planning period in land use system's control: first of all, task of arable land protection must be strengthened, and a rational scale of arable land tenure, the amount of which should be kept about 31.11×10~4ha in 2010 in Yangzhou city on condition that food self-sufficiency rate meets 100%, so that the demand of agricultural production and life can be physically satisfied. And then, scale of construction land must be restricted terrifically, but explore big potential through intensive land use.Some suggestions are put forward in the end: firstly, attaching more importance to ecological land in order to enhance the ability of self-organization in land use system; Secondly, playing the positive role of hetro-organization factors in land use system through a fine relationship between people and land; Thirdly, under the rule of sustainable land use, synergy of self -organization and hetro-organization must be well combined and exerted; Finally, carrying out the very land use planning charactered by both rigidity and flexibility to boost the planning control in land use system.
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