Abstract: The aloe-yam yogurt beverage is a new type of healthy drink made from aloe vera,fresh yam and skimmed milk powder by lactic acid fermentation with 1:1 of Lactobacillus bulgaricus and Streptococcus thermophilus as mixed starter.The formula of materials and the technical conditions of fermentation of aloe-yam yoghurt were optimized by single and orthogonal test.It was proved that the optimum conditions of fermentation technics were the inoculation size of lactobacillus 4%,the temperature 42 ℃ and fermentation time 5 h;The optimum formula was the ratio of powdered milk to water 1:9,and the ratio of yam powder to skimmed milk powder 4:6,sugar 7%,aloe juice 10% and stabilizer made of 0.20% xanthan gum,0.16% CMC-Na and 0.25% sodium alginate.The product was proved to be good on sensory quality,stabilization and very nutritional.

Key words: aloe juice, yam, yoghurt, lactic acid fermentation