In order to evaluate the changes of water resources carrying capacity after co-governance on five water categories was put into effect, taking Linhai City as an example, 17 evaluation indices were selected to construct the evaluation index system of water resources carrying capacity, the method of principal component analysis was used to reduce the dimension of the evaluation index, and a multivariate linear regression model for corresponding driving factors of water resources carrying capacity was set up.Three principal components of water resources natural support capacity, level of social life, and economic development level were extracted, and the entropy value method was used to determine the weight of subsystem, calculate and analyze the composite scores of water resources carrying capacity.The results show that the water resources carrying capacity in Linhai City has an obviously increasing trend after the plan of co-governance on five water categories was carried out, and anti-polluting,seeking for new water supply, saving water consumption are the main factors of improving the water resources carrying capacity.

Taking comprehensive benefits as the target layer, and water resources utilization, economic, social and ecological benefits as the criterion layer, an evaluation index system of for Linhai City water resources allocation scheme was established, and four regional water resources allocation schemes under the idea of co-governance on five water categories were evaluated based on the improved TOPSIS.The results show that the scheme 4 is the best, which is to promote water-saving, to strengthen the development of water resources, and to ensure the ecological water demand.The aim of this study is to provide the theoretical support for the all-round development of Linhai City’ s economy, society, resources, and environment.

Economic evaluation of the highway construction is the main content in the feasibility study. It intends to evaluate the rationality and feasibility of the project which will be constructed, and to provide bases to make investment decision and scheme selection. Taking example by the economic evaluation of a highway project in the north area, this paper introduces the current methods of the economic evaluation of the highway construction.