Abstract: After researches and analysis on status and trend of sandy desertification in Bashang area,the authors found that sandy desertification took a turn for the better in some areas,but it took a turn for the worse in overall situation.The degree of sandy desertification will be exacerbating unless some combating measures are put in effect; Through surveying the causes of sandy desertification and its development,we think that the natural basis of sandy desertification is climate changes,landforms,features of sediment and the condition of hydrology,and it simmediate cause is the unreasonable activities of human being.The harms of sandy desert ification in farming,stock raising,traffic,communication,water conserv ancy facilities and the health of human have been summ arized in this paper,and some measures and proposal on combating sandy desert ification have been put forward.