Objective:To study the effect of polysaccharide in the seeds of Plantago asiatica L on immunological function in mice.Method:Immunosuppressive model in mice was established by abdominal injecting CY.All of the immunosuppressive mice were separated into two groups:the experiment group treated with polysaccharide in the seeds of Plantago Asiatica L in different dose by gavage and the control group treated with levamisole hydrochloride