The transesterification of dimethy1 terephthalate (DMT) by ethylene glycol.(EG) was reinvestigated on the basis of kinetics. A correction was made to the rate equation previously reported by authors. The revised rata equation was derived in consideration of increase of catalyst concentration due to the distillation of methanol from the reaction mixture during the transesterification. A fine agreement between the calculated and observed literature values was recognized. The examination of the equation was made at $mu$$geq$2, where $mu$ is EG/DMT initial mole ratio.