An Elementary Introduction to the Harm and Treatment Methods of Land Desertification? GAO Yan (No.3 Exploration Team, Bureau of Coal Geology, Suzhou, Anhui 234000)? Abstract Desertification is a kind of land deserting. It’s mainly caused by climate and reasonless human activity. Desertification brings serious harm to social and economic life. The two key problems of control of desertification are sand dune fixation and irrigation. The techniques and measures of them include engineering and botanic control, bail and transportation of water, irrigation, and so on.? Key words Land Desertification; Control methods; Sand-barrier; Psammophyte; Irrigation?