Abstract: Grassland is not only herding resources, but also influences soil conservation, ecological balance, climate adjustment, and windbreak and sand-fixation as well. Grassland is closely relative with herdmen’s living and production. Protection of grassland resources and prevention of its disasters are accordingly significant. The paper analyzed the background of grassland of China and the categories and causes of disasters. The results showed that the categories of disasters include drought, wind, biology, desertification, degradation, salinity, heavy snow, fire et al.. The cause of disasters involved both natural factor and human being. Over-cultivation and excess-carrying biology are the main factors from human being. At last, the paper put forward the countermeasures to the grassland disasters.