To formulate the plan, first of all, is the strategic need of building a powerful marine country and expanding the blue economic space. The plan further clarifies that, by 2020, 10 to 20 marine economic demonstration areas will be set up nationwide. The idea is to focus on the differentiated development of policy advantages, focus on optimizing the spatial layout of marine economy, building a modern marine industry system, strengthening the construction of marine infrastructure, and building a blue ecological barrier, etc., to explore new ideas and models, and make them become new oceans Industrial leading area, demonstration area of marine ecological environment protection, and new driving force of marine economic development.

The general idea of the marine economic demonstration area is to make the government's management and the market's behavior organically connected. We will comprehensively implement the national marine economic survey, do a good job in its follow-up application, development, analysis and evaluation, and further understand the "bottom line" of the marine economy. According to the shortlist of the second batch of demonstration cities of marine economic innovation and development announced previously, in addition to Pudong New Area of Shanghai, Ningbo, Shenzhen, Haikou and other cities have been shortlisted, and are expected to obtain hundreds of millions of yuan of central financial support.

"On the whole, although the growth rate of marine GDP has slowed down gradually in the past two years, it is still slightly higher than that of GDP in the same period, and the development of marine economy is changing from speed type to quality benefit type." Relevant expert analysis. In the past five years, China's marine economy has developed rapidly, with an average annual growth rate of 8.1%, according to the economic reference network. By the end of 2015, China's marine GDP had reached 6466.9 billion yuan, accounting for nearly 9.6% of GDP. The marine economy has become a new driving force to support national economic growth and a new engine for economic restructuring.

During the 13th Five Year Plan period, in order to improve the quality and efficiency of the marine economy, we should actively promote the transformation and optimization of traditional industrial technology, and the marine economy will become the pillar industry of the national economy. As predicted by many domestic institutions, with low consumption of material resources, great growth potential and good comprehensive benefits, marine emerging industry has become a "black horse" to promote the development of China's marine economy. But it can not be ignored that although its development speed is fast, its scale has not been bigger.

The basic water situation in China is that there are more people and less water, and the spatial and temporal distribution of water resources is uneven. As an important supplement and strategic reserve of water resources, desalination is an important way to solve the shortage of water resources in China, and also one of the long-term strategies to solve the "water shortage". Since the first "special plan for sea water utilization" was issued and implemented in 2005, great progress has been made in sea water utilization with the concerted efforts of all departments.

"Up to now, major breakthroughs have been made in China's desalination process equipment and key technologies of system integration, and key technical indicators such as system water production energy consumption and operation cost have been synchronized with the world's advanced level." Zhang zhanhaijin, director of the strategic planning and Economic Department of the State Oceanic Administration, pointed out that China's desalination capacity has reached 1 million tons a day, equivalent to the daily domestic water consumption of several megacities. "In essence, desalination is one of the water treatment technologies." Desalination technology is not only for sea water, but also for brackish water in inland areas.

However, the development of desalination industry is difficult to meet the national planning expectations. According to previous reports from China economic network, in fact, the core problem is that the desalination industry is still developing under the market-oriented operation. Compared with the development of water conservancy and municipal undertakings supported by national policies, there is no competitive advantage in terms of production cost, network access price and pipe network construction. According to the public data, the cost of water production from desalination in China is concentrated between 5 yuan / ton and 8 yuan / ton. Although it is close to the international level, the price of water is still higher than that of tap water, which makes desalination a new industry lack of competitive advantage.

As a result, the public may find it difficult to accept the price of desalinated water for a while because of the low price of water. Generally, the cost of desalination consists of investment cost, operation and maintenance cost and energy consumption cost. However, because it has not been included in the overall planning of national water resources before and can not enjoy the "policy dividend", water transfer and exploitation of groundwater are still the first choice in many places. The head of the science and Technology Department of the State Oceanic Administration pointed out that so far, desalinated water cannot enter the municipal pipe network on a large scale, and the proportion of water supply needs to be increased. "It is suggested to establish a national and local coordination mechanism to gradually increase the proportion of desalinated water allocation."