A coup ling device is designed between ultraviolet laser and hollow-core fiber by means of the transmission law of Gaussian beam and the theory ofwaveguide coup ling. In order to reduce the size of light spot resulted from big inner diameter of hollow-core fiber, output end of fiber and lens are coupled , which can ensure the quality of output beam. Hollow-core fiber for ultraviolet laserwith high transmission efficiency can be fabricated bymeans of selecting proper film system in certain capillary.