The synthetic zeolite was type A and the optimum zeolite A was synthesized from the weight ratio of natural zeolite :NaAl$O_2$ : $H_2$O = 1:0.6:8 at 10$0^{circ}C$ for 3hrs. In FT-IR analysis, the characteristic bands were shifted to lower wavenumber with the increment of natural zeolite : NaAl$O_2$ ratio and in TG analysis the weight loss of synthetic zeolite was attributed to the dehydration of water molecules. The weight loss of optimum zeolite was 13.1% of the original zeolite weight.