PURPOSE: A fermented soybean yogurt with lessened unpleasant smell is provided to have rich nutrient and biologically active substance by improving the unpleasant smell and provide the taste and flavor using raw fermented soybean and fermented soybean powder. CONSTITUTION: The 1 ~ 30 %(w/v) solution is made by mixing the fermented soybean powder and raw fermented soybean with the distilled water. Add 1~5%(w/v) grape sugar in solution and heat the solution for 15~30 minutes in an autoclave and cool the solution in 30~50°；C. After diluting a mixed strain in physiological saline, put the mixed solution in the fermented soybean solution as 0.001~0.02%(w/v) and ferment the solution in 30~50°；C for 3~14 hours by suing the shaking incubator. The mixed strain is second kind or more selected from the Streptococcus thermophilus, the Lactobacillus acidophilus, the Bifidobacterium longum, the Streptococcus thermophilus, the lactobacillus bulgaricus, the Streptococcus thermophilus, the Lactobacillus delbrueckii(subspecies) bulgaricus. The mixed strain has a mixed rate of 95% : 5% : 5% of the Streptococcus thermophilus, the Lactobacillus acidophilus, and the Bifidobacterium longum.본 발명은 유산균 발효 청국장 음료에 관한 것으로, 더욱 상세하게는 청국장 분말 또는 생청국장을 증류수와 혼합하여 용액을 만든 후 고압멸균기에서 가열처리하여 멸균하고 냉각한 후, 스트렙토코커스 써머필러스(Streptococcus thermophilus), 락토바실러스 에시도필루스(Lactobacillus acidophilus), 비피도박테리움 롱검(Bifidobacterium longum), 락토바실러스 불가리쿠스(Lactobacillus bulgaricus), 락토바실러스 델브루에키 (아종) 불가리쿠스(Lactobacillus delbrueckii subsp. bulgaricus) 중 선택되는 어느 2종 이상의 혼합균주를 생리식염수에 희석하여 접종하고 진탕배양기를 이용하여 발효시켜 제조된 유산균 발효 청국장 음료에 관한 것이다.
