Welldeveloped progressive metamorphic zone is found in Nanshan area, located in the joint region between the East Kunlun and the West Qinling Orogenic Belt in Qinghai Province. From center to the rim, the metamorphic zone could be subdivided into sillimanite zone, kyanite zone, garnet zone, biotite zone and chlorite zone with the decreasing of metamorphic grade. Among them, garnet porphyroblasts in Gt—Bio granulite show weak growth zoning, and biotite are mainly high temperature ferrobiotite. Based on Gt—Bi thermometer and Gt—Bi—Pl—Q barometer, garnet zone has temperatures of 564 ℃ and pressures of 0.56GPa, kyanite zone has temperatures of 667~670 ℃ and pressures of 0.68~0.71GPa,belonging to medium pressure facies series . Related to the crustal collision thickening of the closure of the PaleoTethys Ocean in the Indosinian.