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In this research food waste and sewage sludge were dried using microwave oven. The drying characteristics and reasonable mixing ratio of food waste and sewage sludge for the effect of physical factor such as moisture contents, drying rate and calorific value. The drying characteristic of microwave oven were evaluated and compared. Sewage sludge was collected in S wastewater treatment plant and food waste was collected in D university restaurant. Microwave oven with 2,450MHz frequency and 700W power is household appliances. When moisture contents of food waste and sludge cake reached 40%, drying time was 4 minute at microwave intensity of 700W. When food waste and dewatered sludge were dried using microwave oven, moisture contents of food waste and dewatered cake were 21.9% and 21.4%, respectively. And these results were higher than mixed sample. It showed that dried mixed sample improved the drying characteristics. The calorific value of food waste and dewatered sludge was 5,788.9cal/g and 3,021.3cal/g at microwave intensity of 700W. The calorific value of mixed materials was higher than dewatered sludge. From this facts, it confirmed that mixed material of food waste and sewage sludge will improve the efficiency of incineration and decrease the auxiliary fuel.