The properties of ink dots determine the color performance of inkjet printed fabrics. The purpose of this study was to enhance the color performance of pigment inkjet printing using the electrostatic attraction force. A cationic modifier was used to pretreat cotton fabric prior to inkjet printing with pigment inks in which the pigment particles were negatively charged on the surface. The spreading test of pigment ink droplet (4.0 μL) was conducted both on the untreated and modified fabrics. The effective porosity of cotton fabric was calculated and its correlation with the Zeta potential of pigment inks was studied. The ink dots on the inkjet printed fabrics were observed under a digital microscope. The colorimetric attributes demonstrated that keeping the pigment particles on the fabric surface by the electrostatic attraction force was helpful to improve the color performance of pigment inkjet printing. The 2-dimensional color gamut of (a^∗, b^∗) was enlarged by 13.4% on the modified fabric as compared to the untreated fabric.