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Can be developed using only the fresh water lakes and rivers and some of the groundwater to the earth is not the sum of 1% of the total amount of water. Is about 1.4 billion cubic kilometersTherefore, we should know the face of the earth can be only one per cent of water for human useImagine that six billion people share only 1.4 billion cubic kilometers of water, each person will be how much?Because of the substantial increase in population caused by the increased population density and increased urbanization. Ultimately it is the problems facing water shortageLet us take a look at the situation in ChinaAlthough China is also rich in water but is not optimistic 1.water resources uneven distribution 2.water shortage aggravates 3) serious water pollutionDistribution of population and water resources from the statistical data we can see that the north-south distribution of water resources in China is very obvious differences. Area south of the Yangtze River basin and its population accounts for 53% of the Chinese, but accounts for 81 percent of water resources. Population accounts for 47% of the North, only 19% of water resources. Experts point out that high-intensity as a result of the natural environment, as well as the impact of human activities, a further reduction of water resources in the north, the south a further increase in water resources. The trend is particularly evident the past 20 years. This exacerbated the water shortage in north China and south-north water imbalance.Although the total water resources in China total 2.8 trillion cubic meters, China's large population, there is also a serious water shortage in the country, the per capita is now only 2200 cubic meters of water, approximately equivalent to the world average of only 1 / 4. Expected 2030 to 1760 will be reduced.Finally, the water pollution problem in China's major causes of water pollution 3:01. Do not deal with industrial water 2. The excessive use of pesticides 3. Does not discharge the water of life standards