A Processing Method Research of Real Signals Based on FFT and IFFF Li Chungaung Ai Chunting Chen Zuobing He GequnIn research we find that the properties of certain complex sequences are extrao rdinarily useful in the sense, data manipulation derive from this property resul t in a sequence. This sequence exhibits symmetry both in time and frenquence dom ain. We can use fast Fourier transform (FFT) algorithms to deal. It will decreas e complex calculate's times, and increase Fourier transform's speed.The index-r eversed complex conjugate sequence and the mirror symmetric complex conjugate se quence were defined.discrete Fourier transform (DFT); inverse disc rete Fourier transform (IDFT); fast Fourier transform (FFT); index-reverse d complex conjugate sequence; mirror symmetric complex conjugate sequence