In order to destroy the waste tear bomb safely and effectively and obtain the optimal parameter of burning destory for tear bomb. Minimum free energy method is adopted to calculate the equilibrium products of combustion from the combustion of the tear bomb at diffierent temperatures and excess air rate. Though it, the way of destroying waste tear gas in incinerator is proved to be feasible. In this paper, the variable concentration of the correlative resultant of the gas is analyzed, the proper temperature is 1047 K and excess air rate is 1.6 which are required by the safe and eddective incineration of the tear bomb.