This paper presents the experimental results on the generation of continuously tunable UV laser radiation in the range of 2800 A to 4100 A. The laser output at 0.3m~0.4m is generated with frequency-summing of the fundamental wave (NdlYAG laser, 1.06 pun) and the output radiation of OPA (continuously tunable from 0.42m~0.7m) pumped by the fourth harmonic wave (0.26m) of Nd:YAG radiation at 1.06m in KDP crystal. Continuously tunable UV laser output at 0.28m~0.3m is generated by frequency doubling the output of Nd:YAG laser SHG (0.53m) pumped rhodamine 6G dye laser pumped by the second harmonic of Nd: YAG laser in an ADP crystal.