The 4A zeolite molecular sieve [Na12 (Al12Si12O48) ·27H2O] was synthesized in a sealed Teflon lined autoclave by hydrothermal reaction of NaOH solution and metakaolinite (the mass ratio of solid/liquid is 1∶20) prepared by calcined coal-measure kaolin from Xuzhou at 550℃ for 2h. 4A zeolite molecular sieve was characterized by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM) and N2 adsorption and desorption isotherm plot methods. The results indicated that amorphous anhydrous metakaolinite was obtained by calcination of kaolin at 550℃ for 2h; it was transformed to 4A zeolite molecular sieve by alkali leaching; the best concentration of NaOH solution was 2mol/L; the pore channel of 4A zeolite molecular sieve was long and narrow,but its shape and size were not uniform.