On the basis of the analysis of various image enhancement methods, a novel strategy is proposed to improve the visual effect of video by using wavelet fusion technology to perform adaptive histogram equalization and fusion process to multi-scale Retinex enhancement images, and the relative fusion rules and algorithms are deduced. Experimental results show that the nighttime image from the video surveillance system processed by the proposed method can achieve an excellent performance with clear details and natural colors, and better than the one processed by a single image enhancement method.