In order to study the high dynamic signal processing algorithm of the GPS software receiver, it is necessary to simulate the digital intermediate frequency (IF) GPS signals. Based on the analysis of mathematical model of the GPS signals, this paper provide a method to simulate the high dynamic GPS IF signals, clarify the procedure of the method , and use MATLAB to simulate the signals. Finally, The GPS software receiver is adopted to validate the signals and the results indicate that this method is able to provide reliable signals for the study of the high dynamic GPS signal processing algorithm.