Abstract: This paper introduces a two-target digital predistortion (DPD) architecture and conducts experimental studies. The two-target DPD architecture can effectively extend the linearized beamwidth of multiple input multiple output (MIMO) systems without increasing system complexity. The proposed architecture adds an auxiliary small antenna array near the transmitter and emits low-power signals to achieve linearization of the system beam. The experimental platform is composed of a four-antenna beamforming transmitter system and a two-antenna auxiliary array. The input signal is an orthogonal frequency division multiplexing (OFDM) signal with a bandwidth of 20 MHz and a peak power of 5. 7 dB/5. 6 dB. Experimental results show that the linearized width of the main beam can reach 22°(adjacent channel power ration (ACPR) is below -50 dBc), the average NMSE in this angle range is -40 dB. The proposed two-target DPD method can effectively widen the beam linearization width of the MIMO transmitter system.