Abstract: In view of heavy losses and harms in economy, environment and ecology etc. caused by the no-flow in the lower reaches of Yellow River, this paper thinks that the no-flow is not only a simple phenomenon of water resources shortage or distributive nonuniformity in water basin system, but also a serious disaster. It is an important content of harnessing Yellow River to control the disaster of no-flow. In this paper the disaster characteristics and basic law of no-flow in the lower reaches of Yellow River are analysed emphatically, the present situation of research is discussed, and the problems to be researched are pointed out in the future.