Abstract: The gangues are coal mining wastes with low calorific value， high ash, and full of difficulties to be combusted in civil stoves or industrial boilers directly. This paper reports the experimental　results　on the thermogravimetric characteristic of gangue combustion and the influence of various alkalimetal compounds upon the　combustion　characteristic of gangues. When the content of alkalimetal　compounds　is　1％,the effect of sodium chloride or sodium nitrate and iron oxide are higher than that of calcium　oxide additives obviously.