Novel application of recombinant human urinary trypsin inhibitor

The invention discloses novel application of a recombinant human urinary trypsin inhibitor. According to the experimental research on animals, the recombinant human urinary trypsin inhibitor has the effects of regulating expression of DC surface molecules CD80, CD86 and MHC-II, influencing T cell proliferation and differentiation, improving maturation state of DC through the expression of surface molecules CD80, CD86 and MHC-II, and further influencing T cell proliferation and differentiation and relieving and regulating negative immunoregulation of T lymphocytes. The recombinant human urinary trypsin inhibitor can achieve the effects of relieving an immunosuppressive state caused by sepsis, particularly cellular immunosuppression, and improving the survival rate of mice suffering from sepsis and the symptoms of sepsis, and can be used for treating sepsis.