In this paper,in order to meet the lig hting dimming requirements,a dimming control scheme with high spectral efficiency is proposed,which is also a key requirement for visible light communication (VLC).The proposed scheme combines orthogonal frequency division multiplexing (OFDM) and multi-pulse position modulation (MPPM),which not only supports high-speed visible light communication,but also meets users′ needs for brightness adjustment of lighting sources.The hybrid modulation method ensures that the system has the dimming function of MPPM and the introduction of OFDM transmission can effectively improve the spectrum efficiency more importantly the transmission of MPPM and OFDM will not intenere with each other,and the detection of the two signals by the receiving end does not interfere with each other which is also simple to implement. Simulation results show that the scheme can support a wide range of brightness and support high-spectrum wireless optical communications.