Abstract: Some of T-type zeolite have been synthesized under different conditions and treated at some temperature. X-ray diffraction and electron diffraction patterns and crystal shape of these zeolite are all the same. Studies of the adsorption of cyclohexane allow to evaluate contents of Erionite and Offretite in T-type zeolite, and thus found out relation between Erionite and Offretite in the mutual transformation of them.