Abstract: An eco-friendly method has been employed for the synthesis of 2-Substitutedphenyl-4-(4-methoxyphenyl)-5-phenyl -1H-imidazole under microwave irradiation .The synthesis of 2-Substituted phenyl -4- (4-methoxyphenyl)-5-phenyl-1H-imidazoles by one step condensation of an substituted aldehyde ,4-methoxyl benzil ,ammonium acetate.The structure of the product were characterized by 1HNMR ,IR ,elemental analysis , and melting point .In conclusion of this method gives some advantages such as a green method , good yield, simple procedure, easy work up, needed short reaction time, less expenditure of energy, and less pollution.