Abstract: In order to reduce the spontaneous combustion danger of Shenfu Coal,an in situ coprecipitation method was applied to prepare Zn Mg AI-CO3-LDHs co mplex inhibitor.Then the inhibitor and a given percentage of the long flame coal from Shenfu Mining Area would be mechanically mixed to prepare the inhibition coal sa mples.A thermogravimetry/differential scanning calorimeter-Fourier transform infrared spectrometer combined technology were applied to analyze the inhibition coal sa mples. The analysis results showed that each feature temperature point of inhibition coal samples would be delay generally than the raw coal and the ignition point of th e coal was increased on the TG curve.When the mixing quantity of the inhibitor reached to 20% of the coal sample,the delay phenomenon would be obvious. The exothe rm temperature would be increased from 135。C to 560 °C and the peak area would be obviously reduced.Therefore,the Zn Mg AICO3-LDHs complex inhibitor could abs orb the heat in multi grade and could control the coal oxidation.The FTIR spectra showed that CO released volume from the coal samples added with the complex inhibi tor would be reduced obviously,therefore, the complex inhibitor would have an obvious inhibition effect to Shenfu Coal.