The Study Of Urban Park’s Environmental Externality And Its Melts Mechanism

Urban park is a form of the public green land in the city. The main elements of the urban park are the natural elements, necessary facilities and buildings. The function of the urban park is provided for city dwellers rides rest, educational, ecological beauty and disaster prevention.Urban green park is an important part of the green land in the city. Its main function is to improve the ecological environment and make the city much beautiful. Besides that, the urban park also can rest and refuge the ornamental disaster prevention, improve the quality of the residents living environment and the people’s quality of life. The urban park can keep healthy and sustainable development of the city.Externality is the goods transform from the parties to the other parties without any relevant economic transactions. we take environmental externality defined as the economy effects the environmental benefits of the other economy without the direct marketing agreement.The melts of the city park s environment externality can be divided into two parts. The first part is the melts of the environment externality in the already exist city park. In this kind of the park, we can learn more about the ecological compensation theory, accordance with the principle of compensation——"who is benefiting who compensate". We can accord the size of benefits to determine the amount of compensation to establish a set of compensation system.The second part is the new building city park. For this kind of the park s environmental externality, we can learn from the property of the theory of city parks. The urban park is the part of the estate project; it must follow the park and property project principle in its building. Eves the park can improve the sales of the real estate project, the sales profit can support the building of the urban park.