The synthesis of zeolite Y and its application in fluidized catalytic cracking could be taken as a milestone in the field of oil refining and petrochemical industry. It is well-known that the framework SiO2/Al2O3 molar ratio（SAR） of zeolite Y determines its thermal/hydrothermal stability and catalytic properties. To improve the framework SAR of zeolite Y can effectively decrease acid sites density， enhance acid strength and thus ameliorate the thermal/hydrothermal stability and catalytic cracking performance. Currently， the high silica zeolite Y used in industry is prepared by complex post-synthesis treatment. Although direct synthesis is an ideal way to obtain high zeolite Y， it remains a challenging topic in the field of zeolite synthesis. Herein， we review the progress in direct synthesis of high silica zeolite Y， including the syntheses both in inorganic and organic systems. At last， we summarize the crystallization mechanism of zeolite Y.