Effects of the silica source, the Si/Al ratio, and the content of template agent and H2O on the synthesis of ZSM-12 zeolite were studied. The optimal conditions for synthesis of pure ZSM-12 were determined as n(Si)/n(Al)=45～70, n (TEAOH)/(SiO2) =0.14 and n (H2O)/n (SiO2) =13 under conditions in this investigation. The physical properties of the products were characterized by means of X-ray diffraction, field emission scanning electron microscopy, N2 adsorption, and NH3-temperature programmed desorption. The results showed that colloidal silica was the best silica source and the Si/Al ratio had major effects on the crystalline phase of the product and the crystalline dynamics under the conditions studied. More specifically, the MFI-type and BEA-type zeolites appeared in product with low Si/Al ratio, and the dynamic crystallization was more effective than the static crystallization in the synthesis with high Si/Al ratio. The ratio of both TEAOH/SiO2 and H2O/SiO2 had strong effect on the phase and morphology of the as-synthesized products.