Abstract: An optimized Radix-4 FFT algorithm is proposed firstly.Based on this algorithm，a pipelined 64-point IFFT/FFT processor，which can obtain 64-point output during 64 clock cycles only by three complex multipliers so as to improve its operation speed and save its hardware resources，is designed.The verification is carried out through the downloaded Xilinx XC2S300E Spartan2E series xc2s300e device，whose result is less than 0.5% difference compared with the result from the MATLAB calculation.The processor has been successfully used to an OFDM communication system.