To investigate the relationship hetween bacterial diversity in fermented dairy products with vegetable and animal proteins. 16S rRNA high-throughput sequencing was used to analyze the microbial diversity in pure soybean and pure milk fermented yogurt, the effect of sugar substitute on the difference formation and predict the functional composition of bacterial community functions in yogurt were studied. The results of a-diversity analysis showed that the bacterial diversity of soybean-based yogurt was higher than that of milk-based one. Adonis ...