To solve the problems of the channel blur

limited channel capacity and higher error rate in Multiple-Input Multiple-Output（MIMO）system

we propose a new channel equalization method to compensate the channel distortion to increase the anti-interference

and enhance the reliability and stability of the transmission system. The method is based on the combination of Constant Modulus Algorithm（CMA）and adaptive beamforming technology in MIMO system with Quadrature Phase Shift Keying（QPSK）modulation. The experimental results show that the proposed QPSK equalization technique can solve the contradictory problem between channel capacity and the bit error rate

and reduce the inter-symbol interference and channel interference. In addition

it can achieve the best performances by correcting the phase error with faster the convergence speed and lower bit error rate lower.