Abstract: In order to satisfy the need of digital ultra highspeed imaging and improve the time resolution of the camera, an optical system of 8frame gated camera applied to 350 nm~800 nm waveband was designed. The structure of the system was based on splitting the focused imaging light beam with the aperture located externally. It could capture 8 of the same object images. The influence of some significant optical parameters, such as image distance and image side numerical aperture on illumination difference between multiframe framing system images, the correction of chromatic aberration in wide spectral imaging system and other problems were analyzed. Moreover,the relay lens was designed and optimized with Code V. The effective image size is Φ26mm,the modulation transfer funtion (MTF) of image space is better than 0.5 at 40 lp/mm, the distortion is less than 1%, and the illumination difference of 8frame images is within ±10%. The results show that the practical system has good imaging quality and each split image has high consistency.