Thirteen compounds of 2-aryloxymethylbenzimidazole were synthesized under microwave-irradiation using PPA-HCl as catalyst. Their structures were identified by IR, ¹H NMR spectra and elementary analysis. Compared with the conventional method, this procedure has the advantages of sample operaration, high yields and short reaction times. The molar ratio of raw materials is n(o-phenylendi- amine)∶n(2-aryloxyacetic acids)＝1∶1.1. The best ratio of volume of catalyst is V(PPA)∶V(HCl)＝1∶1. The available power of microwave irradiation is 650～850 W. The reaction time is 10～15 min.