As new alternatives to CFCs and HCFCs, HFEs have been proposed for cleaning solvents by the Research Institute of Innovative Technology for the Earth (RITE). Azeotropic mixtures composed of HFEs and solvents are essential to improve the low solubility of HFEs. For developing the predictive method of such phase equilibria, the ASOG parameters have been already reported for the systems containing HFEs, alcohols, ketones, esters and ethers. This paper deals with revision of ASOG group pair parameters relating to CF2, CHF2, and CHF groups using binary VLE data. The correlated accuracies of vapor composition and bubble points are 0.016 mole fraction and 0.98 K, respectively, for 45 binary systems.