Abstract: According to the principles that values of solution color are proportional to its mass concentration and RGB color mode of digital image, color solutions could be quantified with imaging colorimetric method by the acquisition of image information of sample solution. Blue CuSO4 solution was taken as the object for experimental analysis. Image information was acquired in the experimental box and statistics regression model was established. It was found that measurement error of the method was 5%, linearity range was in the range of 10.0-50.0 g·L-1, and correlation coefficient was more than 0.990.