1, children: skin sebaceous gland secretion is not vigorous, the skin is smooth, lubricated, delicate, but easy to dry. The maintenance of the skin is mainly based on cleaning. Dry season can be used to moisturize the skin cream. 2, adolescence: sebaceous glands, sweat glands secretion, this period of the skin is generally oily, hair follicle sebaceous ducts easy to block, resulting in sebum accumulation into acne. The focus of skin care is to keep it clean and use cosmetics with special effects as little as possible. 3, Youth: This stage of the skin is more complex, and is influenced by the environment, occupation, habits and other factors, skin care should be from the psychological, life, diet, exercise and other aspects of comprehensive care. 4, middle and old age: this stage sebum secretion began to reduce, the water content also reduced, the skin lost good moisturizing and elasticity. The skin begins to appear dry, pigmentation, skin slackness, wrinkles, seborrheic keratinization and other skin aging phenomena, with the growth of age performance more and more prominent. Active skin care methods should be taken during this period to delay skin aging.