Abstract: BCCD, ICCD, EBCCD are three types of low light level devices based on CCD. Experimental data of their limited resolution, modulation transfer function under various conditions of illumination are presented. The factors which influence the signal to noise ratio of the three devices are analyzed. It is shown that BCCD has a certain low light level imaging ability, and that under moderate light illuminance, the performance of BCCD is better than that of ICCD. Moreover, EBCCD’s performance is beyond ICCD under all kind of light illuminance.