Abstract: Zeolites Y of FAU type containing different transition metal heteroatoms (MY or M1M2Y, where M = Ti, Co, Ni, Mo, Zr, etc) in the framework were synthesized. The effect of different heteroatoms on the crystallinity of zeolite Y was characterized by XRD and SEM. The zeolites MY or M1M2Y exhibit the same phase profiles as zeolite Y by XRD. SEM results showed that MY zeolite is provided with welldefined crystal and larger crystal size. Zeolite Y containing single transition metal heteroatom (MY) exhibits lower crystallinity than zeolite Y. However, the zeolite Y containing two suitable heteroatoms (M1M2Y) has a much higher crystallinity than MY due to the collaboration of M1 and M2; there is an optimum composition for two heteroatoms to get a high crystallinity.