中文摘要：

根据生态径流量的概念，应用逐月最小生态径流量计算法和逐月频率计算法计算了黄河干流唐乃亥、头道拐、花园口3站的生态径流量；根据黄河下游来水来沙量变化规律、断流资料以及利津站入海水量的变化特点，分析了黄河干流不同断面的生态问题．结果表明，逐月频率计算法算出的最小生态径流量，无论在枯季还是丰季都能达到很好的生态条件．

英文摘要：

The ecological runoff for Tangnaihai, Toudaoguai, and Huayuankou stations on the main stream of the Yellow River was calculated by the month-by-month minimum ecological runoff calculation method and month-by-month frequency calculation method based on the concept of ecological runoff. According to the rules and characteristics of water and sand coming from the lower Yellow River, no water data, and variation charactefistics of water volume flowing into the sea, the ecological problems for different cross-sections of the main stream of the Yellow River were discussed. The result shows that the minimum ecological runoff calculated by month-by-month frequency calculation method meets the requirement of good ecological condition no matter in low-water season or in high-water season.