PURPOSE: A producing method of fermented grains containing living effective fermentative bacteria, and the fermented grains are provided to secure the quality of the grains after a fermentation process. CONSTITUTION: A producing method of fermented grains containing living effective fermentative bacteria comprises the following steps: producing the effective fermentative bacteria formed with lactobacillus and yeast; mixing 14-18vol% of moisture, 1-2wt% of solution of the effective fermentative bacteria, and 1-3wt% of natural food preservative into grains; and fermenting the mixture for 3-7 days at 30-40 deg C. The grains are selected from white rice, glutinous barley, glutinous rice, glutinous brown rice, glutinous black, rice, corn, adlay, buckwheat, black bean, adzuki bean, millet, or other grains.유산균 및 효모로 이루어지는 유효발효균을 제조하는 단계; 및 잡곡에 상기 유효발효균을 첨가하여 20~40에서 2~7일 동안 발효시키는 단계를 포함하는 장기간 보관시 유효발효균이 살아있는 발효잡곡의 제조방법 및 상기 방법에 의해 제조된 발효잡곡에 관한 것이다.