Tremella polysaccharide is a water-soluble polymer, the molecular structure backbone of which is composed by α-(1-3)-glycosidic bone linked mannosan, with branched chains consisting of glucuronic acids, xyloses and fucoses. Its active center is a common structural part: α-(1-3)-mannan. Tremella polysaccharides can be roughly divided into five major categories: acidic heteropolysaccharides, neutral heteropolysaccharides, cell wall polysaccharides, extracellular polysaccharides and acid oligosaccharides. Its appearance is white or off-white powder, easy to absorb moisture, soluble in water, prone to disperse in glycerin and propylene glycol, insoluble in organic solvents such as ethanol and acetone.

Tremella polysaccharide can be regarded as a plant-derived hyaluronic acid substance with a molecular weight up to 1.3-1.6 million Da, which is the only plant-derived moisturizer in the cosmetics raw materials industry with a molecular weight over 1 million Da so far. When compared with hyaluronic acid, it has better efficacies in many aspects such as high moisturizing efficiency, anti-oxidation, anti-aging, skin-touch improvement, thickening and emulsification.