Abstract: A series of highly stabilized zeolites（HSZ）with different cell sizes was designed and manufactured by changing the degree of cation exchange and gas phase super stabilization in commercial scale. The catalysts were prepared with HSZ-3，HSZ-4，HSZ-5 zeolites as active component and their catalytic cracking performances were investigated and compared by using automated micro activity test and ACE fixed fluid bed reactor. The results showed that the catalysts with gas phase super stabilized zeolite as active component possessed stronger heavy oil cracking ability，higher yield of gasoline，light oil and total liquid，and better coke selectivity compared with the catalysts using hydrothermal stabilized zeolite as active component.

Key words: catalytic cracking, cracking catalyst, heavy oil, high stability, zeolite