Hsiang-Yang sericite ore is composed of two major minerals-sericite and pyrophyllite. This study investi- gated the effects of temperature, solids/liquid ratio, Na_2SiO_3 concentration and reaction time on the hydrothermal synthesis of analcime. Under the conditions of [Na_2SiO_3]=5M, S/L=1/15, 240°C and 12 hr reaction, the amount of analcime synthesized reached maximum. The analcime crystals show perfect trapezohedron shape.