The FBMC-OQAM is one candidate of 5G waveforms. It has many advantages such as the improved spectral efficiency, better spectral shaping, lower inter-symbol interference and low OOB radiation. However, one significant disadvantage is a high Peak-To-Average-Power-Radio (PAPR). Many PAPR reduction techniques (Clipping techniques, Block coding, Selective mapping technique, Partial transmit sequences techniques and so on) for OFDM systems have been developed but these techniques cannot be directly applied to FBMC-OQAM systems because of the symbol overlapping nature of FBMC-OQAM systems. Thus, we propose a new scheme named as weighted selective mapping algorithm for FBMC-OQAM systems and evaluate the performance in this paper.