Abstract: In order to expand the ultraviolet range of an imaging spectrometer, a Wollaston prism was designed based on the birefringent material of α-BBO crystal. After theoretical analysis and simulation, the data graphs were obtained for some parameters. The splitting angle of the BBO-Wollaston prism has the non-linear relationship with the longer wavelength in the ultraviolet region, but beneficial to the stability of the beam angle in the entire spectral region; larger structure angle will make the field of view angle becomes smaller, and larger structural angle and width will help to promote the spectral resolution. Comprehensive research show that it is proper to design a α-BBO crystal Wollaston prism in thickness from 6mm to 8mm, with the structure angle α≤15°and the angle of incidence smaller than 1°in the ultraviolet to visible band. The results provide a theoretical basis for the further development of imaging spectrometers used in ultraviolet spectrum range.