This paper reports on the treatment of cotton fabric with cationic starch (Q-TAC) polymer, a commercial product, by batchwise method and pad batch method for the first time prior to reactive dyeing process. Furthermore, three commercial reactive dyes, based on monochlorotriazine, vinyl sulfone and monochlorotriazine + vinylsulfone chemistry, were applied on the cotton fabrics by continuous (pad-dry-cure) method. The treated cotton fabric by batchwise method produced 70% higher color yield (K/S) and 20% enhanced dye fixation (%F) than untreated cotton fabric. X-ray photoelectron spectrometer (XPS) analysis revealed the presence of N1s peaks in the treated cotton fabrics. The crystallinity of treated cotton fabrics was reduced in comparison to untreated cotton fabric as revealed by Wide angle X-ray diffraction (WAXD) measurements. Field Emission Scanning Electron Microscopy (FE-SEM) showed that the surface of treated cotton fabrics was rougher than untreated cotton fabric due to the deposition of cationic starch. In this way, cationic starch treatment of cotton fabric before reactive dyeing process has been proven potentially a more environmentally sustainable method than conventional dyeing method. Keywords: Reactive dyes, cationic chemical reagents, cationic starch, color yield, dye fixation.