In order to extract the reliable phases from fringe patterns with large phase variation, the corresponding fringes are analyzed by Paul wavelet transform. Under the condition of different Paul wavelet parameters, the phase extraction process from fringe patterns with large phase variation under noise is analyzed. The method for the selection of scaling factor, wavelet order, and other parameters in the phase extraction process is presented. The results of the simulation experiment indicate that the speed and reliability level of phase extraction from fringe patterns with large phase variation can be effectively improved by adjustment of the parameters for Paul wavelet transform.