A signal analysing system which is based on fast Fourier transform is introduced. The system integrates functions of fast speed data acquisition, frequency spectrum analysis, dynamic monitoring as well as data analysing and processing. Dynamic test and spectrum analysis can be implemented for mechanical parameters. 介绍一种基于快速富里叶交换(FFT)的信号分析系统,它集高速数据采集、频谱分析、动态监测与数据分析处理于一体,可对机械参数进行动态测试和谱分析。