Abstract: In this paper,the effect of new liquid infant milk on immunosuppressive mouse 's immunity function was determinated,Kunming mouses were intraperitoneally injected of cyclophosphamide and divided into 5 groups,each group included ten mouses.Mice were administered 0,1,2,4 g / kg·bw new liquid infant milk for 28 days,and immune organ dirty body ratio,stimulate cell index,antibody generation,rate of macrophage cell in abdominal cavity of mice,NK cell activity were investigated respectively.Compared with model control group,high,middle dose group could significantly increase( p < 0.05)stimulus index,rate of macrophage cell in abdominal cavity of mice,NK cell activity,each dose group could significantly increase( p < 0.05) liver and thymus index,the OD~(413nm)of antibody cell. New liquid infant formula milk had immunity function for immunosuppressive mice.