Peraluminous sapphirine and Al-rich spinel were discovered in rodingitized amphibolite in the Dongdegou, Zhaosu County, southwestern Tianshan Mountains, the content of A12 03 in sapphirine is between 64. 82% and 66.36%, in Al-rieh spinel between 65.24% and 68.54%. According to the sapphirine-bearing mineral assemblages and mineral reaction textures, using the Theriak--Domino software, the metamorphic process of the bulk rock was simulated. The results showed that the peak temperature--pressure conditions were 700 -780 ~C ,0. 65 -0. 75 GPa, reaching granulite facies metamorphic conditions. The peak metamorphic reaction is: amphibole (Am) + spinel (Spl) + anorthite (An) = chlorite (Chl) + diopside (Di) + sapphirine (Spr). Rocks experienced an Al-rich fluid/melt metasomatic metamorphism of high temperature. The occurrence of sapphirine-bearing granulite facies rocks adds new insight for the complicated metamorphic processes of rocks in supra subduction zone of the southwestern Tianshan Mountains, showing important geological implications.