Based on the measurement experiment of oxidation gas products in the process of temperature-up, with the intention of improving the sensitivity of each sign gas for predicting coal spontaneous combustion and operatingness, this paper has researched carefully the change curves which show oxidation gas products of the coal samples of Qingshan mine changing with coal temperature. According to the actual condition of mine, the initial value k is led into, which is the ratio of the series of sums of carbon monoxide and carbon dioxide in the process of temperature-up to the initial value of carbon dioxide, and it raises the quality and sensitivity of forecast curve of sign gas and auxiliary index, and determines the forecast curve and the corresponding fitting curve of the sign gas for predicting coal spontaneous combustion of Yongzi coal of Qingshan mine. So the experiment data can be provided to forecast and predict the mine fires caused by coal spontaneous combustion. Most of all, this is a perfect guide to the safety production in the mine areas according to the sign gases.
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