Low light level (LLL) image procession has become one of the most important task of low light level night vision technology. Image fusion is a newly developing technology which extracts information from multi-channel images to form a more understandable one for the use of observer of decision making system. The laser assistant vision infrared image is obtained by use of infrared laser assistant vision technology. The features of LLL image and laser assistant vision image are different, because the spectrums they respond are different. The fusion of these two kinds of image is realized based on contrast modulation using wavelet transform. The experimental results show that the fusion of laser assistant vision image and LLL image can effectively improve the of quality image. This technology can increase the war field information from the LLL night vision system and extend the detection distance of the LLL imaging system effectively.