The indoor visible light communication system is supposed to provide n ot only efficient communication but also variable illumination according to user demand in differe nt scenarios, such as office,conference room,lecture room,etc.A dimming coding scheme (DCS ) with correction coding is proposed to let the system has both dimming ability and reliable commu nication.First, the system model,principle of coder and decoder as well as the DCS dimming per formance are introduced and analyzed.The dimming interval depends on the length of DCS.And a cascade method can be chosen to expand the dimming range.Then the system with DCS and channel coding are simulated based on MATLAB.The simulation results show that this system can dim effectively and improve the communication quality,Which indicates that the proposed method i s feasible and effective.