Intense pulsed light (IPL) or pulsed intense light is a kind of broad-spectrum light formed by a very high intensity light source after focusing and filtering. Its essence is a kind of non-coherent ordinary light instead of laser, and its wavelength range is generally between 420~1200nm with multi-wavelength non-coherent light, which is a kind of intense light emitted in a pulsed manner. In clinical treatment, different intense pulsed light can be obtained by selecting different filters. The pigmentation in the skin and the hemosiderosis can selectively absorb the intense pulsed light of a certain wavelength to achieve the cosmetic effect of removing the pigmentation and the hemosiderosis. At the same time, intense pulsed light has been widely used in the field of skin and beauty because it is effective in the treatment of vascular lesions, pigmented lesions, hirsutism, scarring, wrinkle removal, acne and photorejuvenation, and it is less invasive and requires no vacation after the procedure. Fractional intense pulsed light, with the most advanced fractional intense pulsed light technology, has a mild clinical delayed response, effectively removes melanin and acne pimples, while stimulating collagen and strong protein to regenerate and reorganize collagen and elastic fibers, repairing while enhancing the function of vascular tissue and improving circulation, not only reducing pores but also tightening skin, increasing skin luster and reducing pores. Photorejuvenation is a non-surgical, non-exfoliating, non-invasive, non-invasive physical therapy that uses intense pulsed light to treat aging skin problems. With its unique broad-spectrum intense pulsed light, it removes various pigmentation spots, freckles, sun spots, red blood, rosacea, hemangioma and bright red nevus, reduces pores, removes fine wrinkles, increases skin elasticity and makes the skin shiny and delicate. Photorejuvenation uses the principle of light selective absorption, with multiple spectral lines, acting together in the deep layer of the skin, which is selectively absorbed by various pigment cells in tissues and hemoglobin in microvessels, causing the destruction and decomposition of various pigment cells without destroying normal tissue cells and also coagulation of microvessels, so as to get rid of pigmentation, age spots, freckles, dark circles and capillary dilation. The use of photothermal and photochemical effects, thermal stimulation of collagen and elastin, regeneration, reorganization and repair of collagen and elastic fibers, as well as the enhancement of vascular tissue function to improve circulation and accelerate the metabolic process of keratinocytes, so that the aging skin can be restored. 2.Hair removal Using the photothermal action and selective action of intense pulse light, the action of the melanin in the hair, so as to destroy the hair growth cells. It does not affect the secretion of sweat gland and sebaceous gland, not only no side effects but also can make the local skin of hair removal become delicate, glossy and white. Photon hair removal: large light spot, fast, no damage to the skin, does not affect the study and work. It can effectively remove excess hair from any part of the body. Such as: legs, arms, lip hair, armpit hair, body hair, bikini line, interdigital development, beard, etc. 3, facial erythrocytes erythrocytes that is capillary dilation, the cause of the onset of the cause, although the combination of internal and external factors, but the external causes the incidence of erythrocytes is higher than the internal causes. The external factors are hormonal, climate, sand, ultraviolet light, etc. For example, people who live in the cold areas of the plateau for a long time or the long-term inappropriate application of cosmetics containing hormones, hormone creams, etc. Internal factors are closely related to heredity. Facial capillary dilation is treated with IPL, which uses selective photothermal action. IPL contains light of wavelengths that can be strongly absorbed by hemoglobin, and when the hemoglobin strongly absorbs the light energy, it will be converted into heat energy to heat the whole blood vessel, causing it to coagulate and necrosis, and finally it will be broken down and absorbed by the human lymphatic phagocytic system, thus achieving the purpose of treating red blood. Generally, 3 treatments are needed, once every three weeks, for more satisfactory results. There is no possibility of recanalization, it is permanent and will not rebound. The protection of erythrocytes should also be noted to avoid excessive hot and cold stimulation, freezing in winter, sun protection in summer and wind protection in autumn. 4, skin pigmentation abnormalities Intense pulsed light has a very effective treatment effect on various types of pigmentation abnormalities such as scars, freckles and age spots. The treatment principle of intense pulsed light is “selective photothermolysis”. The photon energy is selectively absorbed only by the pigmented vesicles in freckles, which are instantly broken up by the blasting effect. The broken melanin dust either falls off with the skin flakes or is phagocytosed by macrophages and discharged from the body with the lymphatic circulation match. The skin after IPL treatment is not more sun-shy than before. Most patients can say goodbye to freckles/ freckle-like nevi for good after only 2-5 sessions with 3 weeks interval. However, you must develop a good habit of sun protection to avoid new freckles from growing back.