Today large municipal waste incineration facilities nationwide are going through property changes. Due to the separate discharge of food waste, combustible content of collected waste is increasing while watery content is decreasing. These changes in the property of waste increases heating value of collected waste, shortening the life expectancy and the rate of operation of incineration facility. In accordance with these problems, this study was carried out to present effective plans to operate incinerating facilities as the quantities of municipal wastes of Incheon have been gradually increasing. We examined the problems caused by the phase change of municipal waste in Incheon and managing plans to control the amounts of heat output when co-incineration of food waste is conducted. It is concluded that we could carry out the optimized operation of incinerating facilities as well as produce economic effect to reduce processing costs when we conduct the co-incineration of food waste and municipal waste, in the trend that the amounts of heat output generated by wastes are gradually increasing. This is because this operation of co-incineration contributes to reducing the amount of exothermic heat.