Everyone washes their face, and the purpose of washing the face is to wash away the dirt, skin metabolites, secreted sebum, sweat, dead cells, and residual cosmetics that float on the face. Washing your face requires water and cleanser, which is used differently on different people’s faces, because everyone’s skin type is different and in different seasons. So we need to pay attention to every aspect to achieve the purpose of cleansing the face and protecting the skin. How to wash your face scientifically should start from the following: 1, choose a good wash water: the water quality of our life contains minerals mostly hard water, which is stimulating to the skin, boiled softened water, reducing the stimulation of the skin. The choice of water temperature should be based on the type of skin, dirt situation, for oily skin, dirt is heavy, the water temperature should be 40-45C, easy to wash away grease and dirt. Dry skin should use soft water, the water temperature should not be too high, 38-40C can be. 2, the correct use of facial cleansers: skin cleansing varieties are many, there are soaps, facial cleansers and other agents, because of the different ingredients added inside, so that its role is different. It is important to choose according to the purpose of personal application. The skin is thoroughly cleansed with it to make it perfectly clean, and for anti-wrinkle and emollient maintenance purposes. It gently exfoliates and cleanses pores, leaving the skin cleaner and more radiant. Improper use may cause skin diseases. Allergic dermatitis caused by skin cleansers is particularly common. For sensitive skin, use a cleanser that contains less fragrance, low water temperature, little alkaline, and a gentle method of washing. The use of facial cleansers: take an appropriate amount of water puff on the face to make the face wet, take an appropriate amount of cleanser (usually 3 to 5 cm) in the palm of your hand, add water and rub until foamy, apply to the face and massage for a minute, rinse off with water. Do not apply the face wash on the towel and then apply the face, as the towel is rough and easy to cause dermatitis. 3, the number of times to wash your face: the average person wash 1-2 times a day. But for oily skin and work environment dusty, dusty weather, we must increase the number of times to wash the face, can be 3-4 times a day. And to use cleansing milk, water temperature should be higher. For dry skin, wash 1-2 times a day, cleansing available neutral soap, after washing can be used externally emollient cream. You can increase or decrease the number of times according to the sweating situation in the summer. 4, for sensitive skin, wash your face with soft water, or cool boiling water, the water temperature should not be too high, for those who wash their faces red, it is appropriate to rinse again with cool water or use a wet cool towel for a few moments, free of skin cleansers. 5, pay attention to the key parts of the cleaning: such as eye sockets, nose, nasolabial folds, auricles, behind the ears, mouth circumference, etc., easy to hide dirt and grime places. Available hot water, soap to help remove dirt. 6, the application of skin care products: application of skin care products in different skin types, different seasons, the use of different skin care products. For example: oily skin, after washing, can be used in summer, available in winter moisturizing skin care milk. For dry skin available in summer moisturizing skin cream, winter is appropriate to use emollient skin cream, nutritional honey. Skin care products can also cause allergic reactions, and those allergic to light should avoid cosmetics containing fragrances. Allergy tests should be done before using new products.