High-pressure pelitic granulite containing porphyroblasts of garnet (Grt), sillimanite (Sil),K-feldspar (Kf) and plagioclase (Pl), and inclusions of spinel (Spl), kyanite (Ky), sapphirine (Spr) and rutile (Rut) have been found from the Ailaoshan orogenic belt, southeastern Tibet, regarded as a key indicator for identification of the boundary between the Indochina and South China blocks. The dynamic metamorphic path was that the metapelitic rock experienced high-pressure/-temperature granulite-facies metamorphism in lower continental crust (≥30 km)exhumated to mid-upper crust rapidly, it might be related to the continental collision and underthrusting between the Indo-china and South China blocks, and exhumation and slip shearing lately.