In this study, the gas release rate and gas composition in the steam gasification of blends of anthracite coal and spirit-based distillers' grains (SDG) with mass ratios of 3: 1, 1: 1, and 1: 3 were studied. The changes in the gasification reaction activity for different gasification temperatures and sample ratios were investigated, and the synergy between SDG and coal in terms of co-gasification was analysed. The results indicated that the instantaneous release rate of hydrogen was higher than that of other gases for all sample ratios. Upon the addition of SDG, the H-2 content increased while CO and CO2 contents decreased. The gasification reactivity increased with decreased temperature and ratio of SDG. Furthermore, potassium and calcium in SDG ash played a synergistic catalytic role in the gasification reaction.