In textile field, digital textile printing has recently expanded its presence as a practical option for printing designs on fabrics, and many users of digital textile printer has actually attempted to widen their business. However, there are many factors that affect printing qualities on fabric. One of these factors is pre-treatment. Owing to proper pre-treatment depending on fabric types, various chemical reactions or chemical interactions between ink and fabric are strictly controlled in printing and steaming processes. Furthermore, adjusting the compositions of pre-treatment solution enables us to control coloring characteristics on fabric under user's printing environment. As a result, high printing quality is achieved by digital textile printing. Thus, in this paper, we focused on pre-treatment process and attempted to alter coloring characteristics on fabric by changing key material such as thickener in the pre-treatment solution.