Coal fires occurring in Xinjiang, Ningxia and Inner Mongolia Autonomous Region of northwest China not only influenced the environment but also consumed valuable natural resource. But because earlier-forecast of coal fires was indefinite, it's difficult to take action to cope with hidden fires on time. Many scholars have made a lot of research about the coal fires, and up to now, it was deemed to be an effective method to make use of representative gases, which emitted from coal oxidation in the adiabatic oven system cooperating with two gas chromatographs, as sign gases to forecast the status of coal spontaneous combustion. Owing to predicting coal fires in Wuda mining area, six representative coal samples were collected from the burning sections of VI, VII, VIII and the measurement experiment of gas emitted from the process of coal oxidation was carried out in the laboratory at 20-400 degrees C. Water was absorbed using drier absorber and the occurrence amounts of gas products were recorded. Then the experiment data was given, in the form of figure after transacting synthetically. The occurrence amounts of gas components display the exponential growth curves with coal temperature as shown in figures. It is concluded that the gas of carbon monoxide, propane, and the alkane ratios can be applied as sign parameters for forecasting and predicting the status of spontaneous combustion.
