介绍多变量约束控制（Ｍｕｌｔｉｖａｒｉａｂｌｅ Ｃｏｎｓｔｒａｉｎｅｄ Ｃｏｎｔｒｏｌ， ＭＣＣ）软件包的整体框架和主要功能，并阐述了ＭＣＣ的控制和优化策略．完整的ＭＣＣ软件包除核心组件——多变量约束预测控制组件外，还包含了模型辨识和数据校正、非线性预测控制、软测量、动态仿真、Ｉ／Ｏ接口、组态、共享数据库驱动、工艺过程动态监控、用户应用程序接口以及历史数据处理等组件．ＭＣＣ技术已成功地应用于一大型催化裂化装置，取得了显著的经济和社会效益 This paper introduces the overall framework and main functions of Multivariable Constrained Control (MCC) software package and describes the control and optimization strategies of MCC. In addition to the core component, the multivariable constraint predictive control component, the complete MCC package includes model identification and data correction, nonlinear predictive control, soft sensing, dynamic simulation, I / O interfaces, configuration, shared database drivers, Process dynamics monitoring, user application program interface and historical data processing components. MCC technology has been successfully applied to a large catalytic cracking unit and achieved significant economic and social benefits