Abstract: This article provides an review of the development of the N-heterocyclic carbenes and as the precursors of the N-heterocyclic carbenes the preparation and characteristics of some 1,3-disubstituted imidazolium salts are mentioned as well. The general property of the synthetic method is researched that comprises a two-step process for preparation of 1,3-dialkylimidazolium salts from glyoxal, organic primary amines and chloromethyl ethyl ether. Starting from 2,6-diethylaniline, tert-butylamine, 1,3-bis-(2,6-diethylphenyl)imidazolium chloride and 1,3-bis-tert-butylimidazolium chloride are obtained successfully; and their structures are characterized respectively.