The work aims to establish an evaluation method for controlling and predicting the print-through quality of printed products to provide theoretical basis for image and text design and paper selection of printed products, and achieve the purpose of economic and high-quality production. Five different kinds of non-coated paper samples were selected to test their compactness, smoothness, ink absorbency and opacity. PTR model was established to evaluate the print-through resistance of paper samples. The five types of paper were printed with CMYK tone block, namely 10%~100% (solid area). The color difference method ΔELab was used to characterize the print-through degree PTq of each tone. With ΔELab=3.5 as the print-through threshold, the relationship between the print-through resistance of the paper and each tone was established. As a result, from 1# paper sample to 5# paper sample, their PTRs decreased successively, the print-through value of CMYK in each tone basically presented the same rule, and the PTR model was established. The corresponding tone values were obtained according to the print-through threshold and the linear formula of each paper sample to calculate the mean tone values of various colors from 1# to 5#, namely 134.15% (calculated value), 88.9%, 51.95%, 42.7% and 36.15%, so as to establish the relation curve between PTR and tone value. In conclusion, the paper with PTR value of less than 70.5% is printable with images whose tone is lower than 40%. PTR value from 71.0% begins to increase, and the printable tone range of the paper is also expanded. When PTR value reaches about 73.8%, even for the solid color block, the image and text on the back will not be interfered.