Introduction to the sandy Hanhai: The formation of the Zhanggutai sandy land is mainly caused by the erosion of the Horqin sandy land in northern Inner Mongolia and the impact flooding and wind accumulation of the Liuhe River. It is divided into quicksand, semi-fixed and fixed sand. Land, of which mobile and semi-mobile sand accounts for about 20%, fixed sand accounts for about 80%, and the main component is quartz sand.