Multiple input multiple output orthogonal frequency division multiplexing (MIMO_OFDM) systems have become a key component of wireless communications in the attempt for effective data delivery. The high Peak to Average Power Reduction (PAPR) of these systems, however, poses a number of fundamental difficulties and can seriously reduce power efficiency and result in non-linear distortion. In order to address the PAPR issue, this paper presents a novel method that combines the Constant modulus algorithm (CMA), Clipping, and Selective Mapping (SLM). The sequence with the lowest PAPR is chosen for transmission after the SLM algorithm creates many candidate signal sequences with different phase shifts. CMA is utilized to keep the modulus of the signal constant, and clipping is applied to cut signals whose peak amplitudes beyond a predetermined threshold. the concatenated method has the best PAPR reduction performance with different antenna configuration and different subcarriers. Keyword: Clipping, Constant modulus algorithm (CMA), Multiple input multiple output orthogonal frequency division multiplexing (MIMOOFDM), Peak to Average Power Reduction, Radio Frequency Amplifier (RF) and Selective Mapping (SLM)