介绍了采用离散傅立叶变换（DFT）实现对采样得到的波形数据文件进行频谱分析的一般方法，并且为了提高运算效率、节省中间存储单元，最终采用了 时间抽选奇偶分解 的 库利-图基算法 实现快速离散傅立叶变换，对采样数据进行了高效的频谱分析，并用Microsoft  Visual  C++  6.0编写实现-Introduced the discrete Fourier transform (DFT) is a general method of the spectrum analysis of the sampled waveform data file, and in order to improve the operational efficiency and save the intermediate storage unit, culminating in the adoption of the　decimation in time parity decomposition　of　the Cooley Tukey algorithm to realize the fast discrete Fourier transform, the sampling data of efficient spectrum analysis, and Microsoft Visual C++ 6.0 to programmed