Hyaluronic Acid (Sodium Hyaluronate),the high molecular weight polysaccharides containing a repeating disaccharide unit(D-glucuronic acid and N-acetyl glucosamine).HA have some unique properties and functions, such as water retention, lubrication,viscosity and good biocompatibility,so HA is widely applied to cosmetics, health food, Beauty filling operation and pharmaceutics,etc.