This report examines the preparation of four types of zeolites(NaA, NaY, ZSM-5, zeolite beta) under microwave heating conditions and discusses the possible contribution of microwave energy to the crystallization of molecular sieves. Preparation of zeolites attempted in this study showed that microwave synthesis technique can reduce the synthesis time to 1/2-1/6 of those required using conventional hydrothermal methods, primarily as a consequence of substantial enhancement in heating rate to synthesis temperature. For ZSM-5 and beta, in which organic amines are necessary as a template to generate a particular pore structure, microwave heating proved to have one undesirable aspect in that it also promotes the Hoffrnann degradation of the templates. As a consequence, for microwave synthesis, it was necessary to use the larger templates. Increasing the total amount of water, leaving the other substrate mole composition other than water fixed, induced faster heating rate to the synthesis temperature due to its high dielectric property and crystallinity of ZSM-5 was substantially increased.