The small radius of microfibers causes some problems with the dyeing process and colorfastness of the dyed fabrics. In this study, we examine the high temperature (130℃) dyeing, light-fastness, and wash-fastness characteristics of seven different disperse dyes on both conventional (5.5 decitex per filament) and microfiber (0.56 decitex per filament) polyester. We analyze regression equations of build-up curves for different disperse dyes in 1/1 standard depth dyeings. Using a spectrophotometer, we determine K/S values at the appropriate λmax for each dye. The extent of dye exhaustion is expressed in terms of color strength (K/S) using the Kubelka Munk equation. The results of our investigation show that polyester microfibers consume two to three times more disperse dye than conventional polyester fibers. The light-fastness level of polyester microfibers is less than conventional polyester. All the disperse dyes exhibit excellent wash-fastness for both conventional and microfiber polyester.