The ultraviolet radiation locates in the spectral range from 400~10nm of electromagnetic spectrum. The ultraviolet radiation has various physical characters and effects. The characteristic of ultraviolet radiation and its applied in military field is summarized in this paper; the overseas status of ultraviolet opticelectronic passive warning technology is analysis; The relative merits of ultraviolet alarm technology and infrared alarm technology is compared; and the prospect of ultraviolet opticelectronic passive warning is discuss.