Abstract: For large power loss and bus voltage instantaneous fluctuation caused by low natural power-factor, unreasonable distribution of traditional reactive power and un-linear shock load in coal mine power supply and distribution system, a solution was introduced in technique and economy, in which part of the traditional reactive compensation and part of the SVC devices should be centrally allocated on 910 kV or 6 kV and 660 V bus in coal mine, SVC capacity should not be less than maximum possible fluctuation amount of bus load; for remote distance big power device, reactive compensation should be installed separately in the vicinity. This combination not only can solve the coal bus voltage instantaneous fluctuation, but also can reduce power energy loss.