Streptococcus suis serotype 2 is an important zoonotic pathogen. It has a lot of virulence factors playing an important role in the pathogenic process. In recent years,the virulence factors of Streptococcus suis serotype 2 have been extensively studied. Virulence factors include capsular polysaccharide,lysozyme-releasing protein,hemolysin and fibronectin protein and so on. In this paper,the research progress is reviewed on the v...