Abstract: Schemes of the downstream products of methanol were optimized by the theory of system engineering and a comprehensive evaluation model involving technology，economics，and market aspects was established by using analytic hierarchy process (AHP) to calculate，analyze，and appraise the schemes of the downstream products of methanol. The conclusion showed that the most ideal product scheme for a coal based 1.8 Mt/a methanol project was to match a 1.2 Mt/a dimethyl ether (DME) project and an effective method was provided for scheme optimization of the downstream products of methanol.

摘要： 按照系统工程理论进行甲醇下游产品方案优化设计，应用层次分析法建立了甲醇下游产品系统综合评价模型，对甲醇下游产品方案分别从技术、经济和产品市场3个方面进行了计算、分析和评价。结果表明：煤基1.8 Mt/a、甲醇联产1.2 Mt/a二甲醚为甲醇下游产品的理想方案，同时也为甲醇下游产品方案优选提供了有效手段。