A concept of environmental factors effectiveness coefficient is raised, and the environmental factors effectiveness coefficient of every stage of spring wheat is worked out which can measure the extent of effect on growth stage.

Basing on the exengy economics analysis,this Article generally considered the affect of the environment factor in the supply chain systerm,and introduced the ideas about "negative effect factor of environment",then make use of comprehensive sub-system of Supply chain theories of system science to analyse the exengies in the supply chain system,and building up the exengy e.

As part of the series studies on ecological restoration technique in the littoral zone of Lake Dianchi,this paper investiga- ted the primary wetland environment and vegetation in the northeastern bank littoral zone of Lake Dianchi,the present environmen- tal bases,the target and feasibility for ecological restoration,the key limiting environmental factors and their controllability.