This paper proposes a new linear precoding algorithm suitable for coordinated multi-point (CoMP) transmission system of joint processing mode. Under the premise of considering the leakage signals and noise at the output of receive filter, the proposed algorithm obtains maximum precoding matrix of modified signal-to-leakage-and-noise ratio (mSLNR) algorithm to better suppress inter-user and noise interference. Besides, the suppression of users' intra-user interference is achieved by minimum mean

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... square error (MMSE) precoding of equivalent channel matrix. Therefore, the proposed algorithm can suppress inter-user, noise and intra-user interference, and can reduce system bit error rate (BER) and improve system capacity. Simulation results show that the proposed algorithm has certain advantages in bit error rate and system capacity compared with other precoding algorithms.