Abstract:The research was mainly about the immunity function of complex probiotics （Bifidobacrium Longum ＋Bifidobacrium adolescent＋Bifidobacrium animalis） and complex probiotics-corn peptide. Mice were randomly divided into seven groups including blank control group， three groups treated with compound probiotics liquid at different doses and three groups treated with complex probiotics -corn peptide at different doses. Mice（SPF grade from Kunming） were continuously eaten after 30 d. The methods for immunity function were relative to weights of spleen and thymus， carbon granule clearance assay， plaque forming assay， DHT， and Elisa. Through the carbon granule clearance experiment， complex probiotics and complex probiotics-corn peptide have obvious changes compared with the control team. Through the splenic lymphocyte proliferation experiment， complex probiotics and complex probiotics-corn peptide have markedly obvious changes compared with the control team. The experiment showed that complex probiotics and complex probiotics-corn peptide enhanced certain parame－ ter of splenic lymphocyte function. Through DHT experiment， the results implied that complex probiotics-corn peptide have changes compared with the control team. Through the Elisa experiment， the experiment implied that complex probiotics and complex probiotics-corn peptide could enhance IgA. In conclusion， complex pro－ biotics and complex probiotics-corn peptide could be able to enhance mice immunity function. The measures of antioxidation function were the content of MDA and the activity of SOD. The results showed that complex probi－otics and complex probiotics-corn peptide could reduce the content of MDA and improve the activity of SOD. The experiment showed that complex probiotics and complex probiotics-corn peptide had antioxidation function.