Eight-bond parametrio approach given by Hens-Sohaad and topological resonance energy (TRE) criterion by Aihara and Trinajstic et al. are two current theories of aromatic stability. It is necessary to reveal the essence of the additivity of the π-electron energy of aoyclio polyenes and to make use of a group of more reasonable parameters instead of the Hess-Sohaad's eight-parameter to describe the additivity.Analyzed in this paper is the relation between the total HMO π-eleotron energy (Eπ) of aoyolio conjugated hydrooarbon and topologioal parameters. Several topological formulas (Eq. 5~10) for aoyolio random olosed walk are also given.