Abstract: In order to elaborate NO emission characteristics of waste combusted in fluidized bed, N→NO of six representative single-component wastes with bed temperature and excess air was studied in a Ф150 mm fluidized bed. The results show that paper and wood have the highest conversion while rubber and plastics have the lowest conversion of N→NO. N→NO of fabric, paper, kitchen residue, wood, plastics has intermediate temperature formation behavior, it generally maximizes during 800 ℃ and 850 ℃, then it will be stable with increasing temperature. N→NO will increase with increasing temperature because coal and rubber's fuel-nitrogen has stable chemical structure. N→NO of mixed waste material is generally less than linear superposition value of single-component waste because of volatile flux's interaction and relatively lower flame temperature; small a mount of water did not affect obviously N→NO, even it can accelerate NO emission, but excessive water will inhibit NO formation behavior.