In this paper, the hydrologic characteristics of semi desert basin was analyzed, two different water balance equations respectively for desert covered area and non desert covered area in semi desert basin were developed, and hence a calculation method for desert covered area was proposed.
分析了半沙漠流域的水文特征，提出了半沙漠流域分沙漠覆盖区和非沙漠覆盖区的水量平衡关系，在此基础上，提出了确定沙漠覆盖面积的水文分析法，确定了毛乌素沙地周围半沙漠流域沙漠覆盖面积比例，并据实地调查资料作了检验。
Because of dry climate ,strong sunlight and lacking water resource in the areas such as Ningxia Gansu and Shaanxi, some districts is becoming desert, so that land is washed away crops are infected and the harnessing of desert is hindered, In order to solve these problems the auto-control water saving system in desert area is designed.
由于陕、甘、宁等半沙化地区气候干燥、日照强度大和水资源缺乏,使许多地方土地出现了沙化现象,水土流失严重,影响农作物的生长,阻碍了沙漠治理的进程。