The aquatic ecosystem of lake is a complex open systems, this study that is based on the principles of maximum flux selects Caohai as the object, we apply complex systems analysis to construct eutropication model which is suitable for local conditions and select a larger time scale and control parameters to simulate the eutrophication status to find out the main factors and to put forward reasonable proposals for giving out optimal control techniques. This model can be expanded in time scale, spatial scale and the number of parameters, while the difficulty of calculation and analysis will not be increased. The trend and influencing factors of the system will be got at the same time.

The paper qualitatively and quantitatively analyzes a multi-state water supply subsystem in one fire protection system using stated analysis technique of GO Methodology. All states and probabilities of components are obtained, as well as minimal cut sets and the probabilities of them under failure states. The results prove to be effective for analyzing reliability of repairable systems with the stated analysis technique of GO methodology.

Based on characteristics of environmental impact of railway construction projects, the paper drew on experience of environmental impact assessment (EIA) projects, carried out preliminary EIA on China's mid-long term railway network plan from macro perspective according to planning requirements, and discussed the key points of EIA on guiding special planning.

The aquatic ecosystem of lake is a complex open systems, taking account of the shortcomings of available eutrophication models for water quality, this study based on the principles of maximum flux selects Waihai as the object, we apply complex systems analysis to construct eutropication model which is suitable for local conditions and select a larger time scale and control parameters to simulate the eutrophication status to find out the main factors and to put forward reasonable proposals for giving out optimal control techniques. This model can be expanded in time scale, spatial scale and the number of parameters, while the difficulty of calculation and analysis will not be increased.