Aromatic polyimides derived from 2,2’-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (GFDA) and 3,3’- or 4,4’-diaminodiphenylsulfone (m-DDS or p-DDS) have been synthesized with a chemical imidization. The disappearance of amic acid groups and the appearance of imide groups are determined by IR and H-1-NMR spectroscopies. The obtained polyimides are amorphous and soluble in organic solvents. The gas transport properties of the polyimide membranes to CO2, O-2, N-2, and CH4 have been determined at 35 degrees C and at a pressure up to 10 atm. The (PCO2/PCH4) and (PO2/PN2) selectivities of the membranes are augmented due to their large gas diffusivity selectivities. This is considered to be due primarily to the high packing density of polymer chain.