The topic of this thesis is ultraviolet communication system,one model of the Free Space Optics(FSO).The Free Space Optics communication system for civil use regards infrared light as transmission medium.However,for military use,if we want to establish a local communication system(about 1.5 km) with jamproof and safe,it is impossible to use infrared as transmission medium.Based on the predecessors' research and struggle,they discovered that ultraviolet light,especially the ultraviolet light in the solar blind light spectrum is a perfect transmission medium.Because of the absorption of air and scattering process in the atmosphere it can provide a suitable transmission distance and the ability to get over obstacles.The importance of the thesis is to introduce the key devices used in the communication system.