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灌溉工程设计标准一般用灌溉保证率表示，常采用经济分析方法进行比较选择，笔者建议采用财务动态分析法，要求灌区内部回收率必须大于12％，净现值必须大于零．其财务分析基本参数包括不同灌溉保证率的灌溉面积、灌溉工程投资、作物多年平均减产系数、灌溉效益、灌溉工程年运行费．基本参数的确定可用公式算出，根据这些基本数据，按财务现金流量，分别计算不同灌溉工程标准的财务内部收益率、经济效益费用比和财务净现值，最终进行灌溉工程设计标准的选择．
Irrigation engineering design standards are generally expressed as an irrigation guarantee rate, and economic analysis methods are often used for comparison and selection. The author suggests adopting the financial dynamic analysis method, requiring that the internal recovery rate of irrigated areas must be greater than 12% and the net present value must be greater than zero. The basic financial analysis includes irrigated area with different irrigation guarantee rates, investment in irrigation projects, multi-year average yield reduction of crops, irrigation benefits and annual running costs of irrigation projects. The basic parameters can be calculated according to the formula. Based on these basic data, financial internal rate of return, economic benefit cost ratio and financial net present value of different irrigation engineering standards are calculated according to the financial cash flow, and finally the selection of irrigation engineering design standards is carried out.