With the development of modern sciences and technologies, digital image processing technique has been widely used in highway engineering quality detection, analysis and evaluation work. In this paper, by referring to the previous research results, MATLAB software programming was adopted to calculate the variation coefficient under different dividing methods. Then the analysis and comparison between the field photos and the texture depth were performed, so as to clarify the feasibility of variation coefficient determining the uniformity of asphalt pavement spreading. At the same time, through the correlation analysis of the texture depth and the variation coefficient, the variation coefficient values under five different region equal division methods could be fitted well with the texture depth, and the corresponding fitting formula was given. By the comparison between the fitting values and the MATLAB software calculated values of the variation coefficient, the high accuracy of the fitting formula was proved.

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