The hypolipidemic and antioxidant effects of dietary supplementation with polysaccharide isolated from Salicornia bigelovii seed (SBS) were evaluated in hypercholesterolemic rats. Following administration of SBS polysaccharide at 200mg/kg BW/day (HPS group), total cholesterol (TC), and low density lipoprotein cholesterol (LDLC) levels were 32.45% and 58.09% lower than those in negative controls (NC) group, respectively. However, in the case of high density lipoprotein cholesterol (HDLC), it was 36.37% higher than that of NC group. The arteriosclerosis and cardiac risk indices were 64.23% and 50.53% lower than in the NC group. However, the HTR (HDLC/TC) value was higher 2.05-fold than that of the NC group. Hydroxy-3-methylglutaryl CoA reductase activity in HPS group was 55.1% lower than that of the NC group. Activities of alanine transferase, aspartate aminotransferase, and alkaline phosphatase in HPS group were 29.71%, 26.49%, and 32.24%, lower than that of the NC group. SOD, CAT, and GSH-Px activities in HPS group were 31.05%, 49.29%, and 54.62% higher than that of the NC group. These results indicate that SBS polysaccharide has both hypolipidemic and antioxidant effects and shows potential for ameliorating hypercholesterolemia.