The performance indexes of online chemical instruments in a thermal power plant are directly related to the security and efficiency of its operation.Based on long-term practice from the production line,this article analyzes three key maintenance points for online chemical instruments in a thermal power plant as well as giving specific optimal measures for their maintenance.%火力发电厂在线化学仪表的运行性能指标直接关系着火电厂运行的安全与效率，由此基于长期的一线生产实践，对火力发电厂常见的三种在线化学仪表维护的要点进行了分析，继而提出了具体的优化维护措施。
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