Abstract: An exponent-type homologous linear rule has been first proposed here,the formula is as follows:P=a+bexp{(K+1)/(2(n+t)+3)} The new homologous linear rule was verified by using the UVphotoelectron spectroscopy data of conjugated and non-conjugated systems.As for organic conjugated homologs,69 sets of ionization potentials were verified.Among them,31 sets belong to two direction extending systems.As for organic non-conjugated homologs,60 sets of ionization potentials were verified.Among all the data,76.74%of the correlation is the"excellent"grades with correlation coefficient r≥0.99,and 20.16%,the"good"grades with r≥0. 95 and 3.10% with r≥0.90.

Key words: Conjugated homologs, Non-conjugated homologs, UV photo electron spectroscopy, Exponent-type homologous linear rule