Abstract: An efficient synthesis of 2-(2-Substituted Phenyl) -4,5- bis (4-methoxyphenyl)-1H-imidazoles by one step condensation of an substituted aldehyde .4,4-dimethyl benzil ,ammonium acetate under microwave irradiation is described .The structure of the product were characterized by 1HNMR ,IR ,elemental analysis , and melting point .The advantage of this method is simple methods ,procedure are a green method ,its milder conditions , necessary shorter reaction time and its higher yields and easy workup.