Radio frequency (RF), also known as radio frequency current, is between the sound frequency and infrared spectrum of a high-frequency AC variation of electromagnetic waves for short. The alternating current that changes less than 1000 per second is called low-frequency current, greater than 10000 times is called high-frequency current, and RF is such a high-frequency current. Radio frequency (3000K-3000G) is the higher frequency band of high frequency current; microwave band (300M~300G) is also the higher frequency band of radio frequency. At present, a lot of studies have shown that RF technology can be applied to remove wrinkles, improve skin laxity and aging, and improve skin quality, etc. It can play its role by reshaping and tightening the deeper layers of the skin, which makes up for the deficiency of the original skin rejuvenation technology that is difficult to improve the deeper layers of the skin, and provides a new option for the development of skin rejuvenation cosmetic technology with good clinical effects and application prospects. In addition, the application of RF technology in various aspects such as acne treatment, hair removal, scar repair, and fat reduction and shaping has also been reported. This non-invasive cosmetic technique is now favored by many people. The therapeutic effects of RF are mainly biological effects on tissues through induced electrical action, electrolytic action, and thermal effects. The human tissue is a conductive body, and when the current passes through it, it causes various physiological effects, including thermal, stimulation and chemical effects, and can even cause damage to human tissues and organs. When the radio frequency current through the human body through the tissue, can be in a second of time in the biological tissue in the electric field of the electrode polarity changes a million times, in the electric field in the charge of the tissue particles to change its polarity at the same frequency, the tissue to the radio frequency electric wave electrical impedance, so that the water molecules in the tissue instantly produce rapid oscillation, so as to produce a sharp back and forth movement or vibration between the electrodes along the power line direction. This kind of friction caused by the movement of charged particles makes the deep layer of the skin produce columnar distribution of heating effect, which can lead to the body’s skin to produce a variety of biochemical reactions. The RF current acts on the skin tissue to produce a reverse temperature gradient, causing the temperature of the tissue below the epidermis to rise more significantly than the epidermis, resulting in columnar heating and tightening of the deep skin and even subcutaneous tissue, and protecting the surface layer to prevent thermal damage, thus achieving relatively selective treatment purposes. This thermal effect can act on skin problems such as skin aging, skin laxity, inflammatory acne and atrophic scarring to achieve the treatment purpose, which provides a strong theoretical basis for the clinical application of RF technology in cosmetology. According to the principle of bio-thermal effect of radiofrequency, after radiofrequency acts on the organism, the temperature of deep tissue rises, leading to blood vessel expansion blood and lymphatic fluid circulation accelerates, local blood circulation is improved, capillary and cell membrane permeability increases, intracellular enzyme activity increases, metabolism accelerates, the body’s immune function is enhanced, inhibits and kills certain pathogenic micro-pass organisms, helps the tissue area affected by edema to stagnant It helps to improve the ability of evacuation and renewal of body fluids and decomposition products in the edema-affected tissues, which can be anti-inflammatory and anti-swelling. In addition, radio frequency can reduce the excitability of sensory nerves, reduce the tension of muscle and fibrous connective tissue, soften the scar tissue, with antispasmodic, pain relief effect compared with laser, radio frequency has the following characteristics: 1, selective electrothermal effect: radio frequency conversion of heat energy generated in the internal tissue, the emitter itself does not heat, no current through the body, so the local action of low temperature and high thermal effect, reduce the damage to the surrounding tissue and Cell destruction, especially the subcutaneous fat liquefaction necrosis is less likely to occur; 2, the melanin and melanocyte effect is slight: radio frequency generated thermal effect and tissue impedance, and melanin to radio frequency energy absorption is very little, so radio frequency is “color blind”, not easy to produce pigmentation; 3, in the dermatology treatment for non-invasive treatment: after treatment Immediately after the treatment caused by dermal collagen contraction, the effect is fast, the effect is lasting after the treatment, dermal collagen continues to increase, most can last 3-6 months, even up to 18-24 months, can regulate the depth of the dermis heated; after treatment, the patient does not need to rest, does not affect the work; 4, safety: because of radio frequency damage to tissue cells is very slight, so the recovery after surgery is fast, basically no purpura, radio frequency knife on the tissue cutting is no pressure cutting, the incision is smooth and fine, no purpura. Pressure cutting, smooth and fine incision, good hemostasis, complete vaporization of the lesion tissue, no charring, adjustable temperature, clear vision; 5, convenient operation: because of the electrode variety, and can be made into a variety of shapes, the working surface can be arbitrarily controlled, dexterous and precise, in any part of the body are convenient operation. At present, RF technology has more applications in skin tightening and wrinkle removal, scar repair, acne treatment, fat reduction and shaping, etc. Tips: Radiofrequency aesthetic is an emerging and most widely used anti-aging treatment for the skin. Radiofrequency treatment is divided into extracutaneous radiofrequency and intradermal radiofrequency. Extracutaneous radiofrequency can be applied to various skin types and various parts of the body, and is a very widely used treatment. Extracutaneous radiofrequency treatment is painless and patients can achieve skin tightening, anti-aging and brightening after multiple treatments; Intradermal radiofrequency is an enhanced radiofrequency treatment, the treatment principle is to pierce micro-needles into the skin subcutaneously and emit radiofrequency in the dermis to achieve the purpose of anti-aging. Intradermal RF has better effect on acne pits, scar, and stretch marks.