Abakh Khoja Tomb, also known as "Xiangfei Tomb" in Chinese historical legends, is the essence and major carrier of Uygur architectural art, and it is subject to repeated repair. As a result of environmental erosion, the decorative glazed bricks of this building were subject to varying degree of damage. Damage and morphology of the glazed bricks of Abakh Khoja Tomb were investigated in order to provide theoretical basis for protecting and repairing mausoleum architecture of the Xinjiang section on the Silk Road. Damage condition of the existing glazed bricks of Abakh Khoja Tomb was understood through field investigation. Surface and cross section of the glazed brick samples were observed by using polarizing microscope. Types of damage present in the glazed bricks were summarized, the differences of the surface and cross-sectional morphology among several glazed brick samples were observed, and then the firing process of glazed brick samples during different periods was deduced. In these samples, 3 blue glazed bricks are fabricated by means of twice low temperature fast firing technology which developed after the 1980s, and the other 2 blue glazed bricks and the green glazed bricks are fabricated by means of once low-temperature fast firing technology which developed after the 1990s.