Abstract:PHL possesses significant antagonist action for immunodepression in mice induced by different immunodepressors. It can reverse the hypomacrophage function and the reduction in percentage of T-lymphoid cell induced by hydrocortisone(50 or 80mg/kg, sc), reverse the reduction of phagocytosis of reticuloendothelial system (RES) induced by hydroprednisone acetate(20 and 40mg/kg, ip), restore the cyclophosphamide-suppressed delayed anaphylaxis reaction in mice (40 and 80mg/kg, ip). In vitro PHL at a dose of 1 and 10μg/ml accelerated lymphocyte mitosis induced by conA and PHA.