Abstract: As a new clean coal conversion process, coal pyrolysis is an effective means to achieve clean and efficient utilization of coal, and is of great strategic significance to the high-quality development of country. Catalytic upgrading of coal pyrolysis volatiles can be an effective way to change the heavier components of tar to higher value-added substances. High value-added Light aromatics such as benzene, toluene, xylene, naphthalene （BTEXN）, which is one of the important ways to realize tar resource utilization. The pore structure of Y-type zeolite was regulated by high-temperature water vapor to explore its effect on the yield and distribution of light aromatic hydrocarbons in coal tar of different coal rank. The results show that high temperature hydrothermal treatment can remove the framework aluminum of Y-type zeolite and form micro-mesoporous structure. With the increase of hydrothermal treatment temperature, the number of mesoporous and the mesoporous specific surface area as well as pore volume also increase, but the damage to the structure of zeolite is more serious. 600 ℃ is the best treatment temperature for hydrothermal dealumination of Y-type zeolite. Compared with direct pyrolysis, the total yield of BTEXN increased by 4.2,5.2 and 2.3 times respectively after catalytic upgrading of three kinds of coal by 600HTY zeolite. Micro-mesoporous Y-type zeolite greatly reduces the mass transfer restriction on heavy macromolecular substances of tar, improves the availability of acid sites of zeolite, and significantly improves the upgrading effect of catalyst on tar.