Abstract: The spectral characteristics of the displacement of the parallel beam splitting prism,made of iceland crystal,were analyzed theoretically and experimentally.The results indicated that,the maximum angle between the e rays and the e waves,and the displacement of the prism were influenced by the wavelength of the incident light.For a common parallel beam splitting prism with certain length, the displacement decreased with the increase of the wavelength of incident light, and the influence of the wavelength on the walk-off angle in the ultraviolet wave band was larger than that in visible and near-infrared wave band.The obtained result is favor for the design and application of parallel beam splitting prisms in wider scope.