通过分析当前中小型电厂的现状 ,提出一种适用于中小型火力发电厂的分布式数据采集系统的设计方案。该实时数据采集系统具有一些特点 ,如通用数据采集 ,分布式硬软件等。系统中有5种电路板用来组成通信控制模块 ,热工数据采集模块 ,电气数据采集模块以及开关数据采集模块。采用一种带继电器的热工数据采集的方法。多任务实时操作系统根据其重要性为各个任务设定启动时间。最后介绍了一套用于分布式监控系统的行之有效的通信规约 By analyzing the current situation of small and medium sized power plants, a design scheme of distributed data acquisition system suitable for small and medium-sized thermal power plants is proposed. The real-time data acquisition system has some characteristics, such as general data acquisition, distributed hardware and software. There are 5 kinds of circuit boards in the system used to form communication control module, thermal data acquisition module, electrical data acquisition module and switch data acquisition module. Using a method with thermal relay data acquisition. Multitasking RTOS sets startup time for each task according to its importance. Finally, a set of effective communication protocol for distributed monitoring system is introduced