In order to detect harmonic real time and improve test accuracy, take chip TMS320F2812 as the control system and add CPLD （Programmable Logical Device） , the harmonic test system is designed. The function features of hardware＇ s each module and software＇s flow chart are introduced in detail. The test results show that the system can detect harmonic correctly. It will be put into operation.%为实时检测谐波，提高检测精度，以TMS320F2812芯片为控制系统，又增加了可编程逻辑器件（CPLD），设计了一种谐波检测系统。详细介绍了硬件各模块的功能特点和软件各模块具体实现流程图。该系统经测试表明，可有效验证谐波检测与控制算法的正确性，并即将投入实际运行。
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