In Hobq sand land and Mu Us sand land of Ordos plateau and Tengger sand land and Ulan Buh sand land of Alxa plateau, informations are investigated in field,and took undisturbed soil and disturbed soil,took field test,analyzed mineral chemical composition, tested and studied physical property and mechanics property of soil sample,made genetic relativity of desert from engineering,hold out instruction opinion doing desert engineering construction,brought forward measure of sand-fixing and windproof erosion.