Porfluoroacyl fluoride was used to catalyze the reaction of cyanurio ohloride with KF in diglyme at 80℃ to give cyanurio fluoride in 80-90℃ yield. At room temperature, oyanurio fluoride reacted with hegafluoropropene in the persenoe of KF to give mono-and di-perfluoroisopropyl-s-triazine, however, with perfluoro-n-propyl-vinyl ether to give only small amount of the corresponding monoperfluoroalkyl produot. The yield was not improved much even at 100℃ for 13.5 hrs. Both the fluorine atom and the perfluoroslkyl group of the partially substituted perfluoro-s-triazine were readily displaced by sodium methogide, whereas treatment of the triazine with methanol in combination with the weaker bases calcium carbonate or potassium fluoride only the fluorine atom was displaced and the perfluoroalkyl group unaffected.