Dimming control can change the luminance of the light emitting diodes (LEDs) successfully to meet users′ various lighting needs.Visible light commun ication (VLC) is a communication technology developed on the basis of the LED li ghting,which has both the dual functions of lighting and communication.Therefo re,dimming control is worthy of in-depth study in the field of VLC.In this pa p er,a new compatible dimming control VLC system is proposed,which fuses single carrier variable on-off keying (VOOK) and multi-carrier hybrid asymmetrically cl ipped optical orthogonal frequency division multiplexing (HACO-OFDM) to realize the dual functions of LED dimming and efficient data transmission.Simultaneousl y,time selective bias is introduced for the mixed signal to ensure that the mix ed signal works in the linear range of LED and eliminate the influence of nonlin ear distortion.More importantly,the introduced time-selective bias will not i n terfere the transmission of VOOK and HACO-OFDM signals.At the receiving end,A C O-OFDM and PAM-DMT signals can be detected independently without affecting the t ransmission performance of each other and the Bit Error Rate of this system will not deteriorate.Moreover,some modules added to the whole system have no signi ficant impact on the system complexity.Simulation results verify the effectiven ess of the proposed scheme.