The shortage of fresh water can be attributed to the lower efficiency in water utilization. The irrigation in many countries wastes overwhelmingly. Some developing countries still use the primitive irrigation system, which is believed to waste at least 70% fresh water.

　　Life water utilization also shows strikingly lower efficiency. Many citizens have no concept of saving water. In most cities in China, fresh water is used to flush lavatories. Moreover, most citizens use wash-machine, which consumes a larger volume of fresh water.

　　Besides, fresh water has been polluted by agriculture and industry activities. Aquaticecosystem has largely been ruined by unrestricted drainage of sewages . In metropolis , the hospitals and laboratories are also the serious sources of water pollution.

　　Governments are expected to launch campaigns against water pollution. Individuals, households, and the states all should use their unique ways to save the limited resources.

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