Based upon the analysis of information transfer of a typical image intensification system, this paper shows that the image transfer from the output screen of the intensifier to the eye makes up limitation to the whole system information amount, and proposes that the use of color image intensification when utilizing the transfor of information as the means of design and evaluation of night vision system, under the condition that the gain redundancy of image intensifier can compensate spectral gate attenuation, will realize larger information amount than the conventional image intensification.