| Sustainable development is a completely new developing concept and developing pattern, which has aroused widespread concern at home and abroad. It demands a favorable ecological environment as foundation. The ecological service function of the forest ecosystem plays a role, which can not be substituted, in maintaining and improving ecological environment. From the angle of systematic science, forest ecosystem, ecological environment system and forestry economic system closely connects with each other to form the forest resources-environment-economy complicated system (FEECS). ChiFeng city, which plays an important role on maintaining regional ecological security, is a very important part providing ecological screen for the north territory of China. For many years, its percentage of forest cover increases continually, while the system operation presents several real problems of no harmony and no stability, so it is of necessity to carry out a research aiming at these problems from the angle of FEECS in order to solve these problems at last. With nature resources economics, environment economics, theory of sustainable development, systematic science, statistic and sustainable management of forest resources, etc., the author carries out study on FEECS in ChiFeng city, applying relevant methods in systematic science and statistics,SPSS15.0 and Excel software 2003. The main contents and results are as following:1)On the basis of keeping abreast of FEECS'structure and feature, the author applies the principles of system dynamics (SD)to study its operation principles, extracting a feedback loop which can be linked with comprehensive evaluation and warning, so as to construct the SD causality figure. Giving the example of FEECS in ChiFeng city, the author quantitatively analyzes the internal link among every core components, and extracts the nonlinear model equation, which not only remedies the defects of study on the theory of FEECS, but also lays foundation for the study of evaluation and warning.2)From the angle of resources and environment economics, the author establishes the index system of evaluation for FEECS'sustainable development. This index system can reflect the existed problems from a quantitative angle as well as connect with warning study. Applying this index system to comprehensively evaluate the dynamics of sustainable development level, capacity and degree of ChiFeng city's FEECS from 1996 to 2005, the author notices that the sustainable development level, capacity and degree of FEECS in the 10 years appears an ascending or enhancing tendency; At the same time, the author also discovers several problems as poor stability of system operation and low stability of technological supporting ability, etc. After analyzing the causes of the problems, from the point of view of FEECS'integral control and regulation, the author puts forward several specific controlling and regulating measures such as: increasing forestry investment, increasing total amount of forest resources, optimizing structure of forest resources, optimizing industrial structure of forestry, attaching importance to forestry science and technology and controlling growth of population, etc.3) On the basis of knowing the causality chain of FEECS'system dynamics, using the principle of SD once more to carry out a systematic analysis of FEECS, the author constructs SD warning model. Combing the development Dynamics of FEECS in ChiFeng city, the author poses 2 measures of state warning and trend warning, at the same time, selects warning index of guiding, forms warning model of trend and constructs the warning system at last, which fill up the blanks of study on the theory of FEECS'sustainable development.
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