Sulfated polysaccharides are kinds of polysaccharides which have sulfate groups in saccharide hydroxyl. The polysaccharides can be obtained by extracting from natural products or artificially synthesized by structural modification. In recent years,it has been demonstrated that sulfated polysaccharides exhibited their antiviral activities both in vivo and in vitro,especially their little cytotoxin compared with other antiviral drugs used in current clinical medicine. The mechanism of antiviral activities of...