Abstract: To improve the prediction technology of "temperature-gas" double index cycle feedback for spontaneous combustion of coal in Wangcai Huopan Coal Mine, the gas products of coal samples under different temperature conditions were analyzed by using programmed temperature experiment. Besides, field measurements were used to determine the distribution range of "three zones" of spontaneous combustion in goaf. Moreover, the CO volume fraction(φ (CO)) at the return air corner was calculated through a mathematical model. The results show that CO and CO₂ are generated at room temperature, C₂H₄ is generated at 98.50 ℃, and the critical temperature for accelerated oxidation is 170.89 ℃. In the 2202 working face, the heat dissipation bandwidth is 39.38 m, the oxidation bandwidth is 74.03 m, and the average φ (CO) at the return air corner is 6.4×10^-6. There is a good correspondence between the maximum temperature in goaf and the φ (CO) at the return air corner, which can be inferred from either of the two parameter values. That is, the φ (CO) can be determined according to the maximum temperature in the goaf, and the maximum temperature in the goaf can also be inferred when the φ (CO) is known, which greatly improves the accuracy of coal spontaneous combustion prediction.