In order to improve the communication performance of point-to-point visible light communication (VLC) system with discrete multi-tone (DMT) modulation,the DMT communication technique and the hardware system are proposed,and the effects of direct current bias of 16-phase-shift-keying (16-PSK) DMT signal and the det ector′s bias resistance on the nonlinear distortion of VLC channel response are investigated. For enabling the VLC channel working at a proper linear region,the best direct curr ent bias of the DMT signal and the best detector′s bias resistance are derived under different communication distances.Under the cases of VLC channel working at nonlinear region and linear region,a series of experiments are carried out under a bit rate of 0.2Mbit/s,and the bi t error rates (BERs) are measured under different communication distances.The results s how that the BER can be decreased from the level of 10－1 without parameter optimizatio n to 10－3 with optimized DC bias and detector′s bias resistance,and the BER value is nearly constant wit hin the communication distance range of 20－90cm,suggesting an enhancement of system st ability.The experimental and analytical results in this paper provide data b asis for system parameter optimization and further improvement in communication performance.