Abstract: The shifting sands at the south edge of Mu Us Sandy Land had been occurred long time ago and were developed centuries by centuries.In accordance with the historical documents, a "Sand Fortress" had been appeared in the area between Linzhou(now Linwu, Ningxia) and Xiazhou(now Baichen zi, Inner Mongolia) in 6th Century(Northern Wei-386-534 A.D). The area in north of Henshan(now Baiyu Mt. Range) had been developed and turned into sand sea in 11th Century(Northern Song Dynasty-960-1127 A.D) and its landscape developed slightly, i.e.present landscape is semilar to that in Northern Song Dynasty. Ordos Plateau had been grazed nomadically before Christ.The Great Wall had been constructed in 272 B.C(Qin Dynasty) at the northern foot of Qiaoshan Mt.(now Baiyu Mt.) had been used as the demarcation line for nomadic grazing and agricultural practices during that times.In the 1st Century B.C, three towns had been respectively established outside the Great Wall in Han Dynasty at the sites of today's Dabchiak, Baichenzi and Jingbian. Furthermore, a town had been established at the site of today's Ulan Balcasu in Tang Dynasty and all of these towns had been prolonged for centuries up to now without any reconstruction of new cities or abandonment of ancient towns. The reserved parts of the Great Wall in the region had been constructed in 15th Century(Ming Dynasty-1368-1644 A.D) and the land areas outside the Great Wall had been recultivated in Early Qing Dynasty(in 18th Century). From that time, some lakes along the Great Wall had dried up and disappeared entirely afterwards.