Abstract: Three kinds of situations which are respectively spontaneous combustion of coal, adding combined inhibitor of halide salts into coal, adding synergistic agents and combined inhibitor into coal were compared and analyzed by H2O2 oxidation test, and then the inhibiting effect of inhibitor on oxidation and spontaneous combustion of fat coal in Lingshi was comprehensively studied. The results showed that new synergistic flame retardant adding green metal slag and red metal slag was best for preventing coal spontaneous combustion and the change rate of inhibition time was 108.67%. Based on the oxidation self-combustion mechanism, the inhibition mechanism was explained