Abstract: Combining the robustness modes and bandwidth occupation modes of Digital Radio Mondiale (DRM) systems, a method of computing Fast Fourier Transform (FFT) algorithm is presented for DRM systems. In comparison with other FFTs. This algorithm produces the in-place, in-order algorithm for variable transform sizes with high operational precision. Therefore it saves storage space, operation and run time. In addition, the program structure of this algorithm is very regular, thus it can be easily achieved by software and hardware. This algorithm is applicable to Orthogonal Frequency Division Multiplexing (OFDM) modules of other systems.