Dot gain parameters of three different kinds of ink on the same paper were controlled by setting the same printing conditions and controlling process. Different ink contrast and dot gain curves were obtained by measuring color patch and color ladder's dot area rate on the test form. The results showed that the black dot gain rate of ink A is the most seriously; the yellow dot gain rate of ink C is the most seriously; dot gain rates of ink B are the most smoothly and regularly; except the yellow relative contrast, other three relative contrast of ink B is biggest; ink A has the minimum color gamut on the whole image tone range, while ink B has the maximum and the smooth color gamut. So ink B has the best printing performance.