探讨了河道内生态需水满足率的定义及内涵，研究了汉江中下游河道内生态需水量，并通过长系列调算分析计算了南水北调中线工程以及引江济汉工程实施后对其河道内生态需水满足率的影响。计算结果表明：调水工程将使汉江中下游河道内生态需水满足率降低，引江济汉工程能显著提高汉江中下游河道内生态需水满足率。

 This paper discusses the definition and connotation of requirement rate of ecological water demand, analyzes the ecological water demand in the middle and lower reaches of the Hanjiang River. Then this paper calculates the effect of the middle line of South to North Water Transfer Project and the Yangtze River to Hanjiang River Water Transfer Project after being completed on the satisfactory degree of ecological water demand in the middle and lower Hanjiang River by long series data calculation. The computed results show that the South to North Water Diversion Project will reduce the satisfaction degree of ecological water requirement in the middle and lower reaches of the Hanjiang River. The Yangtze River to the Hanjiang River Water Transfer Project can improve the satisfaction degree of ecological water requirement of channel of the middle and lower Hanjiang River evidently.