In this paper, soybean as raw material was fermented as soy yoghurt.The optimal fermentation conditions were achieved by the single factor experiments and orthogonal tests as followed:the ratio of soybean to water (g∶mL)1∶10,sucrose content of 8%, inoculated quantity of 5%, fermentation temperature of 40℃, fermentation time of 6 h. This soybean-yoghurt was well in texture ,taste an...