Aiming at the shortcomings of the OFDM system existing high peak average power ratio (PAPR) and traditional selective mapping (SLM) having high complexity and unable to avoid completely the appearance of peak signal, proposes a new SLM-C combination algorithm based on the SLM algorithm and clipping algorithms to reduce PAPR. The Matlab simulation results show that the proposed method can effectively reduce the PAPR of OFDM system, has low complexity and is easy to achieve.