Zeolite fiber was manufactured from the nanosized ZSM-5 crystals. In this process, it was found that the size of zeolite particles (<200nm) play critical role in the fiber formation. To obtain nanosized zeolite crystals, ZSM-5 zeolite was crystallized at the temperature of 100℃ and atmospheric pressure. The size of zeolite was observed to be dependent on Si/Al ratio. Si/Al ratio of 33 was found to be optimum for the synthesis of 200nm sized zeolites. The formation of zeolite fiber was also affected by interaction between particles and solvent, and high adhesion energy of nano-sized zeolite particles. ZSM-5 zeolite fiber does not scatter much light and shows transparency because the size of zeolite particles is below the wavelength of visible light (400-700nm)