Abstract: This study investigates the spontaneous combustion characteristics of combustible materials commonly found in abandoned mine roadways,including raw coal,decayed wood,water-soaked coal,and their mixtures. Programmed temperature oxidation and thermal analysis experiments were conducted to systematically compare the oxidative reactivity, gas generation behavior,and thermal response of these materials under various mixing conditions. The results indicate that decayed wood exhibits significantly higher oxidative activity than coal samples,with greater O₂ consumption and CO production. Water soaking followed by air drying enhances the oxidation reactivity of coal,lowering the initial CO generation temperature by 10 ℃, with Coal No. 14 being particularly susceptible to this effect. In coal – decayed wood mixtures, an increase in the proportion of decayed wood reduces the ignition temperature by up to 155 ℃ and promotes CO generation—by 122% in the 1 ∶ 1 mixture— demonstrating a pronounced catalytic effect of decayed wood on coal spontaneous combustion. These findings provide a theoretical basis for fire prevention in abandoned roadways.