Abstract: Abstract: Colorimetric method is a commonly used method to detect the concentration of material. Because of the sensitivity
difference and observational errors of each person, the accuracy of this method is greatly affected. This paper established the
relationship between the number of models of color readings and the concentration of a substance with five kinds of materialhistamine,potassium bromated, potassium aluminum sulfate, industrial base, urea in milk-as the research object, and selected statistical model from the two aspects of test precision and error analysis.

Key words: Key words: material concentration identification, color reading, regression model, model accuracy, error analysis