The specific position of the group in the molecule has been considered, and a group vector space (GVS) method for estimating boiling and melting points of hydrocarbons has been proposed. Expressions for boiling point T-b and melting point T. have been proposed, with the numerical values of relative group parameters presented. The average percent deviations of estimation of the Tb and T-m values are 1.05 and 7.96, respectively.