The work aims to improve printing quality of digital ink jet printing. Common camera and confocal laser microscope were used to record and compare the quality defects of the web digital ink jet printing. The main quality defects of common digital ink jet printing are as follows: worse color restoration, uneven printing leaflets (“lotus leaf edges”), graphic edge “burr”, printing ink color not as thick and heavy as where needed, back adhesive, misregister in overprinting, enlarged inside page and white line. The reason for quality defects is lack of pressure in digital ink jet printing. In addition, the water-based ink with low levels of viscosity and pigment will result in exceedingly slow rate of drying and poor ink absorption. Therefore, the construction of functional coatings on the paper surface can accurately control the relative amount of the longitudinal imbibition and lateral spreading of a single drop, which is an effective countermeasure to improve the quality of digital ink jet printing.