The catalytic performance and availability of Y-type zeolite and ion-exchanged Y-type zeolite were studied in vapor phase nethanol conversion to hydrocarbons in order to get low olefins among various hydrocarbons. In general, the experiments were carried out at 400 ^oC, equimole of methanol and nitrogen, 0.79 gr-feed/hr·gr-cat of LWHSV（Liquid Weight Hourly Space Velocity） and under atmospheric pressure. The study was performed for the effects of temperature, partial pressure of methanol and contact time on product distribution, and it was extended to the deactivation process of catalyst and its effect on product distribution. Temperature was less effective than the other reaction parameters, and the selectivity for low olefins was improved by lowering partial pressure of methanol and by reducing contact time. As deactivation proceeded, the selectivity for low olefins was increased. The effect of ion-exchange was also studied. It was revealed that the ion-exchange of catalyst could improve both of the selectivity for low olefins and catalyst's life time.