Abstract: Based on the investigation of extraordinarily serious sand storm(ESSS) occurred on May 5th, 1993 in Ningxia Hui Nationality and Nei Monggol Autonomous Regions, the formation cause of this ESSS, its disastrous harms and moving patterns are analyzed. The results show that its occurrence is the comprehensive results of gale, aridity and desertification under the effect of macroclimates, and the losses or harms caused by it are very disastrous, Its moving patterns indicate that establishing shelterbelts or windbreaks and sand control engineering can prevent ESSSand avoid its harms. In view of the natural, social and economic characteristics of areas vulnerable to sand storm, the comprehensive strategies of preventing sand storm, managing desert and utilizing and developing sand land resources are put forward.

Key words: Sand storm, Calamity, Desertification, Preventing strategy