Streptococcus thermophilus separated from tibetan kefirs as well as separation method and applications thereof

The invention discloses streptococcus thermophilus separated from tibetan kefirs as well as a separation method and applications thereof, belonging to the field of microbial technology. The separation method is characterized in that an operation of streaking separation is performed on a M17 culture medium plate, an operation of culturing is performed 48 hours at a temperature of 42 DEG C, a bacterial colony is circular and raised, neat in edge and milk white in color, bacterial colonies which are non-transparent, contain spherical bacteria, can be subjected to wiredrawing, provided with wet and smooth surface, and mostly arranged in chains with different lengths are selected, and no spore is produced; the streptococcus thermophilus is negative in a catalase test, positive in gram stain, negative in a nitrate reduction test, and has no motility and aerobic and facultative anaerobic growth, gelatin is not liquefied, hydrogen sulfide is not produced, and the streptococcus thermophilus is negative in an indole te