In recent years, non-exfoliative and exfoliative fractional lasers, Q-switched lasers, pulsed dye lasers, photodynamic therapy, intense pulsed light, radiofrequency, and other single and combined application techniques of clinical photoelectricity therapy have been widely used, and are increasingly favored by dermatologists. 1, fractional laser Fractional laser is divided into two categories of non-exfoliative and exfoliative fractional laser according to the absorption strength by water. Non-exfoliative fractional laser: a class of near-infrared wavelength, erbium-doped silica glass as the medium of the laser, a typical representative of the erbium glass laser and yttrium-doped neodymium garnet laser (Nd: YAG), only cause coagulative necrosis, does not cause cavitation holes, compared with the traditional homologous laser downtime and scarring incidence rate is significantly shortened and decreased. Some scholars in fractional laser treatment, before and after 3 months of clinical, histological and morphometric evaluation found that: after treatment, the difference between the two in the improvement of facial skin color, texture, wrinkles is not statistically significant. Exfoliative fractional lasers: for surface exfoliation and vaporization, including strong-exfoliation, medium-exfoliation, and micro-exfoliation fractional CO2 10 600 nm, erbium-doped yttrium-aluminum-garnet (Er:YAG) 2 940 nm, and erbium-yttrium-scandium-gallium-garnet (YSGG) 2 790 nm lasers. Fractional CO2 lasers are the most effective treatment available for severe skin photoaging, with fewer complications, faster healing and no downtime than traditional CO2 lasers. Studies have confirmed its clinical and histologic effectiveness. 2, Q-switched laser Q-switched laser mainly has 694 nm ruby laser, 755 nm emerald green gemstone laser, 1,064 nm and 532 nm Nd: YAG laser. Q-switched laser can instantly and selectively blast melanin particles with ns-level pulse width and energy of 200 ~ 450 mJ, which can cause the death of melanocytes or melanocyte-containing keratinocytes, and it has become the most important treatment method for skin pigmentation. 1064 nm laser is the most effective treatment method for severe skin photoaging, which has more complications and no downtime than conventional CO2 laser. The 1064 nm Q-switched laser absorbs oxygenated hemoglobin 10 times more than water and is used for patients with dark skin. The long pulse width PtP laser has shown excellent results in the treatment of vascular disease, and the Q-switched PtP laser has shown clinical improvement in the removal of freckles and tattoos. Clinical findings, the use of higher energy Q-switched laser treatment caused by inflammation after the higher probability of hyperpigmentation, so the current use of a large spot, low energy, multiple repetitions of the treatment. 3.Pulsed dye laser (PDL) PDL principle is based on three absorption peaks of oxygenated hemoglobin (418 nm, 542 nm, 577 nm, of which 418 nm is the largest absorption peak), melanin and collagen, in order to avoid the poor penetration of 418 nm laser, melanin particles are easy to the epidermal damage by its strong absorption, and the choice of the last two peaks near the hemoglobin, melanin absorption 585, 595, 585 and 595, which are all good, is close to the peak. In order to avoid the poor penetration of 418 nm laser and its strong absorption by melanin particles, it is chosen to be close to the last two absorption peaks and the absorption of hemoglobin and melanin by 585 and 595 nm lasers, and at the same time, it is used to treat the dilation of blood vessels, pigmentation, and wrinkles. 4, Intense pulsed light (IPL) and laser is different, IPL is a broad-spectrum multi-color light source (500 ~ 1200 nm), through photothermal and photochemical effects on the skin, at the same time covering the absorption spectrum of melanin, oxygenated hemoglobin, collagen and water to improve the pigmentation, vascularity, pores and wrinkles, etc., is known as the most effective and easiest to handle the treatment method. 5, photodynamic therapy (PDT) PDT refers to the precursor photosensitizer acts on the skin and transformed into protoporphyrin Ⅸ, the latter selectively gathered in the lesion, activated by a specific light source for cytotoxic reactive oxygen species and free radicals, to the excessive proliferation of epidermal cells necrosis, apoptosis, so that photodamaged skin to achieve rejuvenation (to improve the dilation of capillaries, pigmentation disorders and skin texture) effect. the key of the PDT precursor light sensitizer, light source and tissue oxygen utilization. The key to PDT is the precursor photosensitizer, light source and tissue oxygen utilization. The most commonly used photosensitizers are amino ketoglutaric acid and methyl amino ketoglutaric acid. Blue light, red light, PDL, IPL and other light sources are available, and the choice of light source depends on the depth of penetration into the target tissue and the absorption peak of protoporphyrin IX. Studies have shown that fibroblast proliferation and activity increase after PDT treatment, causing a series of molecular changes. 6, radio frequency radio frequency is a frequency of 3 ~ 300 GHz electromagnetic waves, through the action of the dermis collagen, bipolar water molecules high-speed vibration rotation, friction so that the dermis layer is heated to 50 ~ 60 ℃, so that the collagen fibers instant contraction, followed by proliferation, rearrangement, so as to improve the wrinkles of the skin, laxity. Because radio frequency does not rely on pigment clusters, no damage to melanin, so it is suitable for all kinds of skin, especially dark-skinned people photo-aging treatment, the most promising treatment for the future of this group. Including unipolar, bipolar, tertiary 3 modes. 7, joint treatment In recent years, a series of photoelectricity applied to the treatment of light aging, the results are better than a single technology. There are scholars of Asian photoaging patients using bipolar radio frequency based sequential optical joint device (IPL-IR – diode laser) treatment, the results pointed out that the method is effective and for Asian photoaging patients at the same time to solve the problem of skin color, texture, laxity and other issues, and no downtime. Satisfactory results have also been achieved with the use of dual-depth fractional CO2 lasers for the treatment of periorbital wrinkles. In conclusion, the combined use of multiple devices can improve clinical efficacy. 8, conclusion Although the photoelectric treatment of photoaging and its joint application of significant efficacy, but there are still many shortcomings: at present, more than a small sample, short-term study, the lack of prospective, large samples and long-term follow-up research; degree of photo-aging (or the efficacy of photo-aging treatment) evaluation system is not yet sufficient to achieve a rapid, quantitative, accurate and objective in vivo assessment, to be improved; not much research on cellular and molecular mechanisms; different races, skin types of photoaging, and the effectiveness of the treatment. The characteristics of photodamaged skin vary greatly among different races and skin types, so it is worth exploring appropriate treatment programs for different populations and races.