Abstract: We investigated systematically some of the main physicochemical properties of 13 individually ion-exchanged LnY zeolites (LaY,CeY,We investigated systematically some of the main physicochemical properties of 13 individually ion-exchanged LnYzeolites (LaY,CeY, PrY,NdY,SmY,EuY,GdY,DyY,HoY,ErY,TmY,YbY,and Y-Y),prepared by high temperature ion-exchange method (180℃)(10kg/cm²).It was found that there are some obvious rules and features among the main physico-chemical properties of high temperature ion-exchanged LnFzeolites.1.A11 rare earth elements (Ln⁺³) can exchange with Na+ on St-sites in β cage of NaF type zeolite at 180℃ and under treatment in autoclave.There is a very strong correlation between the degree of ion-exchange of individual LnYand their relative crystallinity2.From the change of various main physico-chemical properties of LnFwith the atomic mumber of elements,we found that the dependence of lattice constant,as,specific surface area (S.A.) and dehydration temperature upon the atomic number of elements show the similar features,and such features are particularly obvious for light and mid-rare earth elements and we also found the appearance of gadolinium break.Exist peaks among Gd,Dy and Ho on respective curves.We also found the similar phenomena in enthalpy change of individual Ln⁺³.3.The thermostabilities of LnFvary with the changing of θ-value (Z/r) of Ln⁺³ ions.Amuch higher thermostability of heavy LnYand Y-Yappears.We suggested that the reason of this phenomenon lies in the easiness of diffusion of heavy Ln⁺³ions with smaller radius from St-sites in β-cage onto that of double six-ring (D6R) in high temperatures.This fact leading to the structural stability has been identified by the increasing of infrared vibrational frequenies in D6R of heavy LnFand Y-Y.