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This paper studied that the factors influencing Chinese real estate price. And that the land prices, the macroeconomic situation, the annual income of the households, the process of urbanization, the credit policy, the psychological expectations of consumers, the market investment or speculation, the governments regulation policy etc, Are all the influence factors of real estate prices. And the analysis results to develop appropriate policy recommendations for the healthy and sustainable development of the real estate market.

Aiming at the problem of pollutant migration and deposition in urban sewage confluence pipe, an experimental simulation system of sewage confluence pipe was established. The confluence conditions of three flow patterns ( velocity   ratio   Vaccess / Vtrunk = 0.1 / 0.2 , Vaccess / Vtrunk = 0.1 / 0.3 , and Vaccess / Vtrunk = 0.2 / 0.3 ) were simulated. The changes of sediment thickness, carbon pollutants, nitrogen pollutants, and phosphorus pollutants in different confluence areas were analyzed, and the migration and deposition laws of various pollutants in urban sewage confluence pipe network under different flow patterns were revealed. The results show that when the flow velocity of trunk and branch roads changes, the deposition of various pollutants and the carrying capacity of water flow in the pipeline change, resulting in the change of sediment layer thickness and pollutant content. With the increase of trunk velocity, the sediment thickness in the area before and after confluence decreases, while the increase of branch velocity only reduces the sediment thickness in the area at the back of confluence. Under any flow pattern, the sediment thickness in the retention area (G3 and G4) shows an increasing trend, which is the key area of pollution removal. Under the three flow patterns, the content of carbon pollutants reaches the peak at the TCOD and SCOD values of G4 monitoring point. Increasing the trunk velocity can effectively reduce the content of carbon pollutants. The content of nitrogen pollutants in each flow pattern also reaches the maximum at G4 point, which are 213.6 mg/g, 205.2 mg/g, and 212.8 mg/g, respectively. Increasing the trunk velocity can effectively reduce the nitrogen content at points G1-G4, while increasing the flow velocity of the branch road can reduce the nitrogen content at points G5-G7. The distribution of phosphorus pollutants is complex, and the flow pattern needs to be adjusted according to different monitoring points.

The sustainable development of the northern Shaanxi area has been severely restricted by the increasingly serious issue of the environmental pollution and ecological destruction in the energy and chemical industry base there. This paper, based on the thorough analysis to the investigation data about the environmental status and the existing problems of energy and chemical industry base in northern Shaanxi, construct evaluation index system of the base sustainable development. The paper evaluated comprehensively the level of sustainable development in energy and chemical industry base in Northern Shaanxi based on statistical data in past years. It reveals the contradiction and the plight of economic, resource and environment in the process of current base, and shows the urgent problems which must be solved in the future.

With the rapid economic development, energy and environmental issues of the energy and chemical industry base in northern shaanxi have become increasingly prominent. As an important power, market forces are bringing into play a more and more important role in environmental protection. Under this background, this paper attempts to explore operational model of pollution control of middle-and-small-sized enterprises (MSEs) in the energy and chemical industry base in northern shaanxi. Environmental protect was brought into the operation process of the market mechanism, government's environmental management cost has been greatly reduced.