Abstract: The important aspects of system simulation are the application of the model and how to accurately model the behavior of power amplifiers.In this paper, we propose the memoryless and memory non-linear power amplifier models on the basis of the original Saleh model.Utilizing input and output data extracted from freescale semiconductor transistor MRF21030 model and designed circuit in ADS circumstance, simulate two kinds of models, compute normalized root mean square error (NRMS) and compare with error of the polynomial model.The results show that the proposed models have a simplified structure and reductive coefficients than the original Saleh model, describe the nonlinearity and memory effects for power amplifier accurately, be applied in the weak non-linear systems circuit.