The asymmetric Zchannel is a discrete memoryless channel with one of the input symbols transmitted with noise. The maximum a posterior probability (MAP) decoding algorithm was analyzed

and a modified decoding algorithm on the asymmetric Zchannel was deduced. Based on the algorithm

simulations on the performance of turbo codes have been carried out

and the key issues of simulations are discussed. The simulation results show that turbo codes can get excellent bit error rate performance on the asymmetric Zchannel with our proposed decoding algorithm.