Abstract: This paper reports for the first time ¹H NMRspectra of 19 kinds of iodinatcd compounds and iodonium heterocyciic compounda. In this paper, the Laciors affecting aromatic proton chemical shifts, such as the type of subsiitutnts, the solvent and nature of the counter ion arc discussed. Contribution of the iodonium substituent to the chemical shift increments of aromatic o-,m-,and p-protons is discussed, too.