Abstract: Dihydroxyacetone is an important intermediate product in the organism metabolic processes， it can participate in the metabolism through the glycolytic pathway， and effectively regulate the relationship between glucose metabolism and fat metabolism. The dihydroxyacetone used in feed additives can effectively improve the biological carcass quality and improve the function of animal body. The effects of the choice and additive mass of drying aid in the process of using spray drying technology to produce dihydroxyacetone feed additives was detected. In order to improve the powder collection rate and the dihydroxyacetone retention， and reduce the water content of the product， we added a certain amount of drying agent to the fermentation broth during the experiment. The results showed that it was suitable to add 60% maltodextrin， 8% β\|cyclodextrin and 4% arabic gum in the feed solution of the spray drying （the solid matter in liquid is for reference）. In this condition， the powder rate of feed additive was 87.4%， the retention rate of dihydroxyacetone was 881%. After storage for 10 months， there was no mildew and no discoloration and the product contained 50.4% dihydroxyacetone， 41.9% drying aid， 5.3% water and 2.4% other compositions．

Key words: dihydroxyacetone, feed additive, spray drying, drying aid