我国是一个水旱灾害频发的国家。长期以来,我们对人多地少的国情认识比较充分,但对人多水少的国情还缺乏足够的认识。那我国水情是怎样的呢?一是水资源时空分布不均,人均占有量少。我国水资源总量2.84万亿立方米,居世界第6位。但人均水资源仅为世界平均水平的28%。从水资源时间分布来看,降水年内和年际变化大,60%～80%主要集 Our country is a country with frequent floods and droughts. For a long time, we have fully understood the situation of a small number of people and less territory, but we still lack sufficient knowledge of the conditions of our country where there is little to no water. Then what is China’s water regime? First, uneven distribution of water resources, per capita less. China’s total water resources 2.84 trillion cubic meters, ranking sixth in the world. However, the per capita water resources are only 28% of the world average. According to the time distribution of water resources, the variation of annual and interdecadal precipitation is large, and the main set of 60% ~ 80%