The purpose of this study was to evaluate the effect of Baekhasuoyijung-Tang(BHSYJT)on mouse T cell cytokines. The proliferation of mouse CD4 T cells under the influence of BHSYJT extract was measured. When mouse CD4 T cell were stimulated with anti-CD3 and anti-CD28 in various concentrations of BHSYJT extract, it increased proliferation of CD4 cells by 28% in $10{mu}g/m{ell}$ concentration and by 32% in $100{mu}g/m{ell}$ concentration. Treatment of CD4+ T cells stimulated by anti-CD3e and anti-CD28 with BHSYJT resulted in reduction of $IFN-{gamma}$,but IL-4 levels is not changed. Oral administration of BHSYJT resulted in increase of both CD4+ and CD8+ T cell population in Balb/c mice by 11%. Oral administration of BHSYJT resulted in reduction of serum $IFN-{gamma}$ level by 27% but, IL-4 level is not changed. CD4+ T cells under Th1/Th2 polarizing conditions for 3 days with BHSYJT resulted in decrease of $IFN-{gamma}$ level in TH1 cells. Experimental results of this study show that BHSYJT helps to reduce secretion of $IFN-{gamma}$ by mouse T helper cell in vitro and it had the same effect in vivo. Thus, it can be concluded that use of BHSYJT is an effective treatment for correcting immune imbalance in immune disorders and autoimmune diseases by reducing secretion of cytokine by Th1 cells.