in the first, data acquisition, the diagnosis of the representative actuator faults and the closed analysis of the control system are discussed; then the contents of the " thermal control system analysis online and fault diagnosis system " particularly are described . these contents include the constitution of the software and the hardware, design project, software development, system's functions and the applications on the spot, and so on 本文首先从理论上讨论了数据获取、执行器典型故障的诊断及控制系统闭环分析等内容;然后重点讲述了“热工控制系统在线分析与故障诊断系统”的软硬件构成、设计方案、软件开发、系统功能以及现场应用情况。