The uptake of disperse dye into polyester fiber in supercritical carbon dioxide was measured in the pressure range between 150 bar and 300 bar at each temperature of 333.3 K, 373.2 K and 413.2 K, and the uptake in supercritical HFC-134a was measured in the pressure range between 50 bar and 160 bar at each temperature of 383.2 K, 413.2 K, using a flow-type apparatus with a cylindrical dyeing vessel. The effect of dye uptake in supercritical fluids on temperature and pressure was investigated. The dye uptake at constant pressure was much increased with temperature than it did with the pressure at constant temperature. The equilibrium uptakes of disperse dye in the supercritical carbon dioxide were compared with those in the supercritical HFC-134a. The equilibrium uptakes in the supercritical carbon dioxide were much great than those in the HFC-134a at the same temperature. The supercritical carbon dioxide is better supercritical media than the HFC-134a, even though dye in the supercritical HFC-134a is much solved than in the supercritical carbon dioxide.