With the development of communication technology, the author introduced the characteristics of current electronic technology and the complexity of electromagnetic environment, pointed out the challenge for measuring electromagnetic interference, and proposed to use realtime spectrum technology for that. The hardware construction, detection method, and time for measurement are compared and analyzed for traditional scan spectrum analyzer and real -time spectrum analyzer, which proved the advantages of the technology of real -time for reducing occasional interference and co-channel interference. Finally, the author got the conclusion that the real-time spectrum analyzer is more exact than the traditional scan spectrum analyzer through measuring the transient electromagnetic interference in practice.%回顾通信技术的发展,并结合当今电子技术的特点和电磁环境的复杂性,针对EMI测试所面临的挑战,提出使用实时频谱分析技术.通过分析传统扫描频谱分析仪和实时频谱分析仪在硬件结构、检波方式和测试时间上的区别,论证了实时频谱分析技术在解决偶发信号和同频信号捕获上的优势；通过使用传统扫描频谱分析仪和实时频谱分析仪对瞬态信号的测试案例,直观感受到了实时技术在EMI测试中的准确性.
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