Abstract: In this paper, the statistical characteristic of Clark reference radio channel was analyzed, and its deterministic simulation models were also given, some high performance computation methods of channel parameters such as Doppler coefficients, Doppler frequency and Doppler phase were put forward, E.g. Exact Doppler Spread Method (MEDS) and random MEDS. Base on MEDS an improved parameter computation method is proposed for Rayleigh fading channels. The new model employs random wobble in Doppler frequency for all individual sinusoids. Simulation results and pictures shows that the second-order statistics(autocorrelation and cross-correlation of quadrature component) of the new model match the desired ones exactly better than the R_MEDS even if the number of sinusoids is a single-digit integer, and compare to the MEDS the new model has random Doppler frequency. Moreover, the new model can be used to generate Rayleigh fading ,multiple uncorrelated Rayleigh fading and frequency selective fading channels etc, and the random wobble amplitude can be set according to project needs, ensure the unification of uncorrelation and ergodicity of fading channels ;