The anti tumor and immune activity of Algae Compound Preparation were studied in this paper. The results showed that Algae Compound Preparation could inhibit the growth of S 180 tumor planted to mice with the inhibition rate of 37.98%~50.38%. The life of ascites tumor mice were also prolonged with the prolongation rate of 21%~51.33%. At the same time the activity of apleen cells and the phagocytosis activity of macrophage were also enhanced.