In order to ensure printing quality of HP Indigo digital press 1050, the prints was printed on three kinds of paper through different compensation curves and changing developing drum voltage and laser energy value. With testing the solid ink density and dot area percentage of prints, the effects of these factors on digital printing quality were studied and two methods that adjusting dot area percentage were compared. The results indicate that different compensation curves have different effects on dot gain, the increase of developing drum voltage can improve solid density, and the increase of laser energy value can enlarge dot area percentage and the method using color control to adjust dot area percentage is more accurate than color match.