L/EU-1 composite zeolites were synthesized rapidly by the method of crystal seed in extremely dense system,the synthetic samples were characterized by XRD,SEM,NH_3-TPD,TG-DTG and so on. The results showed that with increasing the mass fraction of boron and iron in the original sol,the characteristic diffraction peaks of L in the composite zeolites migrated to higher angle and lower angle direction,respectively. The cell parameters and cell volume of L zeolite were decreased and increased,respectively. L / E...