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The retention indices of branched-chain alkane, benzene ring, alcohol, amine, ketone, aldehyde and cyclic compounds were measured at 150, 180 and 210℃ on OV-1701 and OV-1 capillary columns. The group retention factors (GRF) of the substituents and the st` ructure retention factors (SRF) of the molecular structure change are derived from the retention indices of reference compounds and series of homologues. The GRFf equation of `f'th substituent is GRFf = Iobs-(100Z + ΣGRFi + ΣSRFi)and the SRFf equation of `f'th molecular structure group is SRFf = Iobs-(100Z + ΣGRFi + ΣSRFi). The predicted retention indices for those compound were in agreement, within the error of ±2 and ±3%, with the observed values that were obtained using the OV-1701 and OV-1 capillary column, respectively. The △ xi of the substituents and △ yi of the molecular structure change according to temperature change are derived from the △ I/℃ of reference compounds and series of homologues. The △ xi equation of the `f'th substituent is △ xf = △ I/℃ + Σ△ xi + Σ△ yi and △ yi equation of the `f'th molecular structure group is △ yi = △ I/℃ + Σ△ xi + Σ△ yi. The predicted △ I/℃ for these compounds were in agreement, within the error of ±18% and 17%, with the observed values that were obtained using the OV-1701 and OV-1 capillary column, respectively.
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