Zeolite with sodium oxide content less than 1 wt% is mixed with one or several carbonic compounds as forming assistant and water in the weight ratio of 100 to 1-15 to 50-140, and the mixture is extruded into stripes and contacted to steam-containing atmosphere with steam weight air speed of 0.05-3.5/hr at 500-870 deg.c for 0.5-8 hr. The said method is suitable for industrial production.