中文摘要：

灌区节水改造工程涉及内容复杂，点多、面广、线长、量大，与原设施交织在一起，致使工程费用与效益难以识别，给经济评价带来了一定的困难。对此，以某大型灌区改造工程为例，探讨费用与效益计算分析方法，为类似工程提供参考。

英文摘要：

ussed, which provides reference for similar projects. Because water-saving reconstruction project of irriga＇ tion district includes many complex contents, which have characteristics of many dots, wide area, long line, and mixed with old installations, it＇ s hard to distinguish its project cost and benefit. All of the reasons cause difficulty in eco- nomic evaluation. Taking reconstruction project of a certain large--sized irrigation district for example, the method of calculation and analysis about cost and benefit is disc