Abstract: A multiresolution 64-level QAM (quadrature amplitude modulation) for application of terrestrial digital HDTV broadcating is investigated in this paper.The bit error rate (BER) performance of MR-64QAM in the presence of additive Gaussian noise and Rayleigh fading is derived and simulated with computer.The results indicate the evaluated BER performace coincide with the simulation results.In order to improve the BER performance of MR-64QAM in the presence of Rayleigh fading,a concatenated coded modulation must be required.