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由于排水工程不能产生直接的增产效应，其增产效益容易被忽视，为了正确认识排水工程的经济效益，加强排水工程的统筹管理、运行，增加水利投入，用减产系数法从土壤质量变化的角度计算了盐碱地治理中排水工程的效益。以治理前盐碱地产量低于同等条件非盐碱地产量的百分数（称减产系数）为基础来计算，使排水工程效益与灌溉、农业、生物等综合措施的增产效益，定量地区别开来。
Because the drainage project can not produce direct production increase effect, its production increase benefit is easily overlooked. In order to correctly understand the economic benefits of the drainage project, strengthen the overall management and operation of the drainage project, increase the water conservancy investment, and use the method of reducing production coefficient to calculate from the perspective of soil quality change. The benefit of the drainage project in saline land management. Calculated based on the percentage of non-alkaline production of the former saline-alkali land under the same conditions (the so-called production cut-off factor), the benefits of the drainage project can be quantitatively distinguished from those of comprehensive measures such as irrigation, agriculture, and biology.