In the covid-19 epidemic period, in order to investigate the research and application of various ultraviolet disinfection technologies, low-pressure mercury lamp and ultraviolet light-emitting diode ( UV-LED ) as the mainstream ultraviolet disinfection light sources in the market are investigated. The principle, application and main characteristics of the two light sources are briefly introduced and the research progress, application sites and potential of UV-LED single wavelength irradiation, pulsed irradiation and multi-wavelength synergistic irradiation are introduced and evaluated. The 222nm safety ultraviolet disinfection technology was introduced and its application was prospected. Finally, the problems of UV-LED at the present stage are discussed and the prospect of the development of UV-LED disinfection market is presented. It is expected that the future UV disinfection market will form mercury lamp, LED as a supplement, the two complementary pattern.