Silicone oil and polydimethylsiloxane can be used well in the production of cosmetics to improve the performance of cosmetics. Silicone oil has a combination of low surface tension and viscosity, which can make other components of cosmetics easily diffuse into a film on the skin without a sticky feeling. The detackifying properties of silicone oil make it compatible with petroleum jelly, paraffin wax, beeswax, lanolin, etc. When combined to obtain a non-sticky product, volatile silicone oil can give cosmetics the properties of quick-drying, smoothness, anti-fouling gloss, etc. As a cosmetic carrier, it can quickly dissipate and make other cosmetic components into a uniformly distributed film. It is very important in eye cosmetics and nail polish. In hair care products, silicone oil and polydimethylsiloxane can increase hair shine, and at the same time, it can stabilize hair and prevent hair from sticking together. In shampoos, silicone oil can make the hair easy to comb. In skin care products, the hydrophobic film formed by silicone oil and polydimethylsiloxane can prevent other components from being washed away and keep the skin in normal air permeability. Silicone oil has become an important ingredient or auxiliary in many cosmetics.