To increase the computation efficiency of multi-scale retinex method(MSR) in image enhancement,in which the Gaussian convolution has to be used for several times,especially when large scale Gaussian convolution template is used to get the low-frequency information of image,the convolution template is simplified as mean template because the Gaussian template of large scale Gaussian convolution has the property of mean template.Furthermore,a filter window irrelevant mean filtering algorithm is proposed to fulfill and speed up the filtering process.It employs an array s to storage each column pixel value of current filtering rows and consequently reduces the redundant calculation.Taking the 640 × 640 color image as an example,the processing time is only 0.0867 s and it is 723 times faster than original MSR method.It can be seen from the analysis of experiment that the new proposed method can greatly improve the computing efficiency and fulfill the image enhancement remarkably.