Abstract: To analyze the optic imaging characteristics and the FOV quality of ultraviolet (UV) image intensifier, a method for testing the resolution and FOV quality of UV image intensifier was put forward. Under the condition of the photocathode irradiated by the typical 254nm UV light, we applied working voltage on the image intensifier, focused the testing targets on the focus plane of the coaxial reflect optic system, and the image was trebly reduced on the screen of image intensifier. The imaging could be seen distinctly by adjusting the objective and ocular, and the lowest line pair observed by 30 video microscope was the resolution. We used digital camera to take photo of the image on the screen, and the spots were measured through image processing software. The testing results of the field showed that the measurement precision was about 5%，which validated the feasibility of the testing method.