本文分析了MRP逻辑运算中确定净需求量的方法，讨论了诸多文献中关于净需求量的计算公式。
An approach to determining net quantity-demand in the MRP logical operation is analyzed. The formulas of determining net quantity-demand in the literature are discussed.
MRP计算净需求并建议或创建计划订单一满足需求。
It calculates net requirements and suggests or creates planned orders to fill them.
目前，在生产实际中，MRP系统是通过计算按时间分段的总需求和净需求，并以间断的时间序列来表达对物料的需求。
Currently, in the actual production, MRP system is calculated on a time span through sub-total demand and net demand, and to express the demand for materials with the intermittent time series.
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