Control performance monitoring and assessment (CPM/A) plays great role in ensuring process working safely and efficiently. However, for a control system, the importance of the performance indicators is with different degree but in conflict,e.g. maintaining the operating point on the borderline is contradict with the aim of safety. In this work, a priority strategy for CPM/A system is presented, which monitoring and accessing the control system rank by rank so as to monitor the key variances relevant with safety in particular. A prioritized CPM/A system in multi-variable Model Predictive Control (MPC) systemis developed for FCCU reactor-regenerator system and shows its advantages.%控制系统性能监控和评估的研究对保障生产过程安全高效运行具有重要意义。对于一个控制系统，各种监控评估指标的重要性不同却有内在冲突性，例如控制系统的性能“卡边”操作与安全生产有时是矛盾的。因此，提出了优先级性能评估与监控的思想，系统依照优先级序列对各指标进行性能评估，并对事关安全的关键过程变量重点监控；开发了针对MPC多变量控制系统的优先级性能评估与监控系统，并应用于催化裂化反应-再生系统。
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