Abstract: The dust-storm refers to a weather phenomenon: a large amount of dust-storm suspending in the air for a certain time.There must be two conditions for its formation: one is dry climate and strong wind; the other is sand particles susceptible to be blown away. Dust-storm often occurs in arid and semiarid zones of north and northwest China and cause severe damages to local industries, agriculture, communications and transportations. Therefore,great attention must be paid to this problem. In 1955-1956, airborne dust were determined at the Ying Shui Qiao area along the Baotou-Lanzhou railway by our institute. The institute adopted the methods of weight and precipitation and selected four levels of2,5,9and 13 meters, considered as the harmful height so as to determine airborne dust-storm. From the determined data,several laws of vertical distribution and of the relation between dust-storm in atmosphere and wind speed were obtained by using mathfmatic statistic techniques.They can also be referenced in similar areas.