Zeolite synthesis from the coal ash of a circulating fluidized bed combustor (CFBC) was examined in order to reuse them effectively. In this study, Zeolite Pt was successfully synthesized by hydrothermal alkali treatment following the pretreatment of ashes. The possibility of synthesizing zeolite was determined from XRD analysis, surface observation by SPM (scanning probe microscopy) and the capacity of ammonium ion adsorption.