Objective To investigate the influences of Rhodospirillaceae on immune function of mice.Methods Four tests were performed in mice after 4 w medication with different doses of Rhodospirillaceae ig,including:1.The transformation of spleen lymphocyte(MTT method);2.The phagocytosis of macrophagocyte(semi-vivo method);3.The value of HC50; 4.The activity of NK cell(LDH method).Results1.The transformation of spleen lymphocyte;2.The phagocytosis of macrophagocyte,the Value of HC50 and the activity of NK cell in test groups were all raised,the differences were significant and very significant when compared with the control group.Couclusions Rhodospirillaceae could enhance the cellular and humoral immunity of mice.