Abstract: Under climatic conditions of semi-dry and near warm temperate zone steppe in the eastern part of Ningxia, situated in the transitional region between typical steppe and desert steppe. There are different points of view concerned with the demarcation line between these two steppes. In accordance with structure and component of the vegetation, distribution and sere of Stipa bungeana and Stipa breviflora steppe. The demarcation line between these two steppes has been suggested. Besides, how to divide the line in the transitional region of steppe and its meaning in the use of grassland were described.