Abstract: In the previous papers^[4,5], the authors modified the Huckel MOtheory and proposed the Linear Rule of the Homologous Energy Factor, which states that the energies E(n,k) of the molecular orbitals and the physical properties Pof the homologs of different structural types are linear functions of the homologous energy factor X(n,k): E(n,k)=a+bX(n,k) X(n,k)=2l-1/ksinkn/2n+1 P=a'+b'X(n,k) In the present investigation we have collected the vertical ionization data of many homotegous conjugated systems by using UV Photo electron speptroscppy and verified the proposed Rule with satisfactory result. Comparison with Tsiang Min-Chien's Rule of Homologous Linearity was discussed in detail.