Abstract: By adding seed crystals of the zeolite NH₄ZSM-5 the separation o nucleation and growth of NH₄ZSM-5 was made to a certain extent. Under the approximately complete growth conditions the law on the growth of the crystals was investigated and it was shown that the growth of the crystals of zeolite NH₄ ZSM-5 obeys a kinetic law of the order 2/3. The factors which influence the growth of crystals were examined and the apparent activation energies for growth of the crystals were obtained.The relation of Si/Al ratios of products to Apparent Activation Energies for growth of the crystals was also obtained.