Abstract: Communication systems always suffer the in-band distortion, spectrum regrowth, and BER degradation since the nonlinear effect of high power amplifier (HPA). This paper proposes a new joint nonlinearity reduction method by combining the predistorter and tone reservation using null subcarriers (TRNS) method. Tone reservation method is used to reduce the peak-to-average power ratio of the transmitted signal, while predistorter is applied to extend the dynamic range of HPA. Simulation results show that the proposed method can improve the total performance, especially, under low input back-off (IBO).