Hyaluronic acid, also known as hyaluronic acid, is one of the components of human dermal tissue and is widely found in the intercellular matrix. It can absorb 500-1000 times the volume of water and is by far the most powerful moisturizing substance with strong water locking ability to keep the skin moisturized. However, as we grow older, hyaluronic acid will be lost and its water retention capacity will gradually decline, making it prone to dry skin, poor skin condition, phenanthrene, and fine skin lines. In this case, candidates can improve the skin condition by supplementing exogenous hyaluronic acid to maintain the skin, which can play a role in delaying the aging process and keep the face in a very good condition. However, the effect of hyaluronic acid external application is very little, similar to the efficacy of other cosmetic skin care products, and does not play the maximum role of hyaluronic acid. Because the human facial skin has a barrier, only small particles of skin care products can penetrate, and hyaluronic acid molecules are large particles, can not penetrate through the stratum corneum into the epidermis, can only play the role of wetting the stratum corneum, can not do the effect of contour filling, long-term moisture, whitening and wrinkle removal.