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中文摘要：
生态需水量的确定关系到河流生态恢复及地区经济与环境协调发展，是维系生态系统平衡的保障。为降低单一计算方法带来的误差，利用7Q10法、NGPRP法及Texas法等9种水文学方法对汉江中下游基本生态需水量进行了计算，并对其结果统一用蒙大拿法进行归类，得出基于蒙大拿法的合理生态需水量。同时，从众多生态需水概念中提出了表征生态需水动态特性的生径比概念，并用蒙大拿法、Texas法、逐月频率计算法、月保证率设定法及其改进法计算了汉江中下游汛期与非汛期的生径比。
英文摘要：
The calculation of eco-water demand relates to the ecological restoration and coordinated development between regional economy and environment, and eco-water demand is also the guarantee of maintaining the balance of ecosystem. To reduce the error by a single method, the paper uses nine kinds of hydrological methodologies such as 7Q10, NGPRP and Texas methods to compute the basic eco-water demands in the mid-lower reaches of Hanjiang River, and classifies the calculated results with the Montana method to obtain rational eco-water demands based on the Montana method. Meanwhile, based on many concepts of eco-water demands, the paper presents a concept of REF （ the ratio of the eco-water demands to stream flow） , a parameter reflecting the dynamic nature of eco-water demands, and by Montana method, Texas method, monthly guaranteed frequency method and its improved method, the REF in flood season and non-flood season in the mid-lower reaches of Hanjiang River are calculated.
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