Recently, the Department of Dermatology of Zibo Hospital of Traditional Chinese Medicine introduced an Italian DEKA 308-nanometer excimer light ultraviolet therapy instrument, which provides better treatment for vitiligo, psoriasis (psoriasis), dermatitis, eczema, palmoplantar pustulosis, pemphigus, baldness and other skin diseases. In order to keep the skin white, avoiding ultraviolet rays is the daily homework of many people. However, for some people with skin diseases, UV rays can be a good thing. Ultraviolet light is invisible light, wavelength 200-400nm, ultraviolet light of various biological effects have certain spectral characteristics, the size and nature of its effect is related to the wavelength. The ultraviolet spectrum can be divided into three bands: long-wave ultraviolet (UVA), wavelength 320-400nm; medium-wave ultraviolet (UVB), wavelength 280-320nm; short-wave ultraviolet (UVC), wavelength 200-280nm. the so-called phototherapy is the use of the biological efficacy of the light to treat the disease of a method. Ultraviolet phototherapy for the treatment of dermatological diseases originated in the 1920s, and has a history of nearly one hundred years. Due to the development of science and technology, the technology of artificial light source has developed rapidly, and its application in developed countries such as Europe and the United States has become quite mature and popularized, and it has been recognized as one of the preferred, economical and effective treatments for the treatment of common intractable dermatological diseases. The therapeutic mechanism of UV phototherapy is to regulate the DAN of epidermal cells and immune cells in the dermis to achieve the therapeutic purpose. Currently, the most commonly used UV light therapy devices are those with wavelengths of 311 nanometers (narrow spectrum mid-wave UV NB-UVB) and 308 nanometers. 308 nm excimer light is now globally recognized as the most effective treatment of vitiligo, psoriasis (psoriasis), eczema and other skin diseases of the ultraviolet light, compared to, 308 excimer light energy density of 50mW/cm2, several times more than the narrow-wave UVB 311 nm ultraviolet light, so that each irradiation treatment is generally no more than 60 seconds, the course of treatment can be greatly shortened, and the efficacy of the treatment will not be in the later stages of treatment gradually The amplitude of 308 excimer light is only 1 nanometer, which is very strong in targeting and suitable for localized lesions on face, hands and feet. Italy Deka company in 2001 is the world’s first research and development using xenon chlorine (XeCl) unstable excimer can produce 308nm nano-spectrum, and stabilized in ± 1nm, energy density of 50mW/cm2. Deka 308 excimer light generation of equipment since 2004 to sell in China, has been used in more than 50 hospitals. The ExciliteCμ third generation fiber-optic-conducted excimer phototherapy device is now available, with the advantages of easy operation and stable performance, it has become the new main phototherapy device for the treatment of vitiligo, psoriasis, eczema, pemphigus and other dermatological diseases. Since April 2004, the Department of Dermatology of our hospital has introduced 11 sets of ultraviolet phototherapy instrument, which can carry out NB-UVB (311nm narrow-spectrum medium-wave ultraviolet) whole-body or local irradiation treatment, 308nm excimer light ultraviolet local irradiation treatment, with remarkable therapeutic effect, which has brought a more safe and effective treatment for the majority of dermatosis patients.