Streptococcus straw green, also known as Streptococcus aureus hemolyticus, is one of the important normal flora of the human body, distributed in the upper respiratory tract, the gastrointestinal tract and the reproductive tract of women, with the oral distribution being the most abundant. Recently, a gene-related classification was used to classify the bacteria into 10 species, including Streptococcus lite, Streptococcus haematobium, Streptococcus miller, Streptococcus salivarius and Streptococcus mutans, which can cause various infections to occur. Streptococcus gramineus is still the main pathogen of infective endocarditis, accounting for 30%-40% of all pathogens, with a decreasing trend from 75% in earlier years. The bacterium can also cause sepsis, with Streptococcus gramineus accounting for 2.6% of positive blood culture bacteria.