Araliaceal plant polysaccharides have wide biological effects. The antitumor activities of Acanthopanax Giraldii Harms Var.Hispidus Hoo plant polysaccharides (AGP) are becoming increasingly an interesting topic. In this thesis, some aspects of the efects of the AGP on the tumor have been studied, including the in vitro antitumor activity, the induction of apoptosis, the suppression of oncogene and/or the activation of antioncogene, and the modulation of cell factors.