借助频度统计、理论分析、专家咨询三种方法来筛选建立区域生态环境需水的评价指标体系；

Then the index system of eco-environmental water demand has been established by three different methods step by step.

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阐述了火山灰活性、烧失量、细度和需水量比等品质指标对粉煤灰质量的影响，对粉煤灰品质提出了要求。

Effects of quality index, which are volcanic ash activity, loss on ignition, fineness and water demand ratio, on quality of fly ash are expatiated, the requests to quality of fly ash are put forward.

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