Sea level rose and forest were destroyed at an unprecedented rate during the last decade. A series of environmental problems such as the deterioration of ecosystem， the extinction of bio-species， damage to the ozone layer， the green-house effect， acid rain， have posed a serious threat to human living conditions.// Environmental crisis leads to one of the serious problems， namely， water shortage. Presently， more than 40% of the world's population， more than 2 billion people， now face water shortage. It is predicted that with the global population expected to increase from six billion to eight billion over the next 25 years， more pressure on environmental protection stress is expected.// As a developing country， China is confronted with the dual task of developing the economy and protecting the environment. Proceeding from its national conditions， China has， in the process of promoting its overall modernization program， made environmental protection one of its basic state policies.// It is known to all that protection of the ecological environment and biodiversity is the focal point of environmental protection work. China is rich in wildlife species. There are about 6，000 vertebrates alone and 30，000 species of higher plants.//
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