根据广播系统专家多年积累的经验，系统分析了广播发射机的工作原理，总结了广播发射机在实际运行中可能出现的故障，建立了关于广播发射机故障诊断的知识库，对专家系统的数据结构和搜索策略进行了优化分析，提出了一种对诊断型专家系统进行优化的原则和方法．本专家系统在实际运行中可以诊断到输入输出端口、部件、器件和部分元件的故障［１］． According to the experience accumulated by broadcasting system experts over the years, the working principle of the broadcasting transmitter is analyzed systematically, the possible failures of the broadcasting transmitter in practical operation are summarized, the knowledge base of the broadcasting transmitter fault diagnosis is established, the data of the expert system Structure and search strategy are optimized and analyzed, a principle and method of optimizing diagnostic expert system are proposed. The expert system in the actual operation can be diagnosed to the input and output ports, components, devices and some components of the fault [1].