Ecological forestry is a kind of development mode of modern forestry that conforms to the ideas of sustainable development,whose core is pursuing the optimal balance of ecological economy.China is a typical developing country of forestry.The development approach of China's ecological forestry is that: strengthening greatly the eco-moral education of the nation,doing well with the law construction,intensifying the resources management of ecological forestry and establishing thoroughly the sustainable development strategy,etc.

Because the environment has not a market,the loss of environmental pollution has not a direct market price.It is necessary to calculate the loss caused by environmental pollution and change it into currency so as to be compared.There are some methods of assessment:the method of changing productivity,the method of opportunity cost,human capital method,the method of instauration and protection fee,shadow project method;survey-based valuation method,result-checking method,the methool of land value loss,etc.

Circle economy is an ecological economy.It is also an economic model which is based on the material's continuous circle use and is good to the earth.Its characters are the low putting in and high use of natural resources and the low emission of the waste materials.It is the request of times and an important way to realize the sustained development.At the same time,it is also a basic method to protect environment and reduce pollution.Developing circle economy means environmental protection and the 3R principle is the major expression.Ecological industry is the best form of circle economy.Ecoindustrial park is a new industrial organization form according to the principle of circle economy and industrial ecology.