Abstract: In order to understand an inhibitor affected to the coal spontaneous combustion,based on a programmed temperature rise experiment of the coal spontaneo us combustion,primary oxidation and secondary oxidation spontaneous combustion feature parameters of the residual coal in goaf were tested and measured after the inhi bition with CaCl2,Mg Cl2,NH4CI and NH4H2PO3. The results showed that the inhibition effect of the inhibitor to the primary oxidized coal sample was NH4CI>Ca Cl2>Mg C 12>NH4H2PO3in sequence and the inhibition effect of the inhibitor to the secondary oxidized coal sample was NH4CI>NH4H2PO3>Ca Cl2>MgCI2 in sequence. The中( CO) 1 p( CO2) and inflexion temperature of the coal sample after inhibition would be reduced in comparison with raw coal sample. When the temperature was at 30 ~ 103 °C,the inhibition role of the inhibitor was conducted on the primary and secondary oxidation and secondary oxidation residual coal in goaf. When the temperature was at 103 ~ 14 0 °C,a promotion role of the inhibitor was conducted on the primary and secondary oxidation and secondary oxidation residual coal in goaf.