The reliability of optical streak camera in the environment of extreme radiation and electromagnetic field has been investigated on “Chenguang” Accelerator. The image of a series of pulse laser was used to indicate the scanning status of the streak camera. The influence of different manners of radiant and electromagnetic shield has been explored. At last, the conditions of this kind of streak camera working normally in these extreme environments were gained in this experiment: enhancing radiation shield to reduce the equivalent air absorbed dose of single shot near the streak camera to 6 μGy, reducing the outer covering gaps of the streak camera, using photoelectric trigger and so on.