Objective: To explore the change of serious abdominal traumatic patients cellular immunity and the effect of Astragalus Injection (Al) on it. Methods: Sixty-three serious abdominal traumatic patients were randomly assigned into two groups, the conventional group and the treated group, patients in the conventional group were given conventional treatment, while others in the treated group were given conventional treatment as the basis, with Al 20 mi was added into 250 mi of 5% glucose solution given through intravenous dripping, and then on the first day and 14th day, their T cell activated antigens as well as that of 10 healthy subjects were monitored.Results: On the first day, in the conventional group and treated group, the levels of CD3 + , CD4 + , CD4 +/CD8 + ,CD16+ , CD69 + and CD3 +/homologous leucocytic antigen-DR (HLA-DR+) were apparently lower than those in the healthy group (P＜0.05), while the CD8 + was significantly higher than that in the healthy group ( P＜0.05), and there was no significant difference between the conventional group and the treated group (P＞0.05) ; on the 14th days, the levels of CD3+, CD4+, CD4+/CD8+, CD16+, CD69+ and CD3+/HLA-DR+ of the treated group gotclosed to healthy subject value, and got even higher than those of conventional group (P＜0.05); CD8 + got close to that of healthy subjects, while obviously lower than that of conventional group (P＜0.05). Conclusion: After serious abdominal trauma, cellular immunity lowered, auxiliary use of Al was beneficial to the restoration of cellular immunity.