A novel process for organic template-free synthesis of an aluminosilicate zeolite of ZSM-34 from an assistance of zeolite L seed solution has been presented. ZSM-34 zeolite was hydrothermally synthesized in a poly-(tetrafluoroethylene)-lined stainless steel autoclave with starting gels in the presence of zeolite L seed solution. For the preparation of starting gel, NaOH was dissolved into water, followed by introduction of colloidal silica. After stirring the solution, Al2(SO4)3 was added, followed by the addition of zeolite L seed solution. After being stirred, the mixture was transferred into an autoclave to crystallize at 100°C for 7-17 days. The product was collected by filtration. washed with deionized water, and dried in air. It was observed that zeolite L seed solution plays a key role for the crystallization of ZSM-34 zeolite.