The existence of the special apatite-orthopyroxene association in the felsic gneiss of the Larsemann Hills, east Antarctica, suggests the granulite facies metamorphism of the gneiss. The concomitant fluid-absent partial melting in the felsic gneiss was responsible for the melt segregation and residues which were favorable for the formation of Ap-Opx. The residual minerals like apatite and ilmenite are enriched in REE and have strongly affected the REE patterns of the rocks. The presence of the Ap-Opx assemblage implies the existence of appropriate but insufficient effective CaO component in the system. The crystallization of minerals in order of apatite, magnetite-ilmenite, garnet and orthopyroxene has demonstrated the changing mobile-residual components and progressive dehydration in the high-grade metamorphism. The metamorphic felsic rock rich in Ap-Opx is the unique rock derived in metamorphism, with no corresponding protolith.