Desertification is a serious global ecological problem. At present, the land area ofdesertification and sandification still reaches more than 36 million square kilometers in the world,covering 1/4 of the global land area, and the rate of desertification is still expanding by50,000-70,000 square kilometers per year. Desertification is one of the important causes of poverty,hunger and social instability and even triggering unrests in many parts of the world. Theecological, food insecurity and peace crisis caused by desertification are a serious threat to humansurvival and development. More than 160 countries with nearly two billion people globally areaffected by desertification, especially in many Asian and African developing countries. The annuallosses reach to the scale of 40 to 50 billion US dollars。