Abstract: The mesoporous Y zeolites were prepared by hydrothermal synthesis method with three block polymer（F127）or cationic surfactant cetyl trimethylammonium bromide（CTAB）as template. The samples were characterized by XRD，SEM，TEM，N2 adsorption and desorption，and NH3-TPD. The catalytic cracking properties of the catalysts synthesized were evaluated in a micro-activity test unit，and light diesel was used as feedstock. The results of XRD and SEM showed that the hierarchical Y zeolites prepared using template had no difference in the structure and morphology with conventional USY. The analysis of N2 adsorption and desorption isotherms and NH3-TPD demonstrated that the mesoporous volume and total acid sites increased with the addition of templates. Compared to conventional catalyst CAT，the catalyst F-MCAT preparaed by F-MUSY using F127 as templates exhibited a better catalytic cracking property，and the micro-activity was 3.89 percentage points higher than that without template. It is concluded that the abundant mesopores volume and appropriate acidity have a stimulating effect on catalytic activity.

Key words: Y zeolite, template method, mesoporous, catalytic cracking