The Baishiquan mafic-ultramafic intrusions associated with magmatic Cu-Ni-PGE sulfide deposits are located in central Tianshan block of northern Xinjiang. They are Late Permian mafic-ultramafic rocks which intruded into the Mid-Proterozoic sequences comprising schists, gneisses and marbles. They display ellipse and irregular forms in plan, and are basin-shaped in the cross section. The Baishiquan intrusions are comtposed of pyroxene peridotite, olivine pyroxenite, troctolite, hornblendite, gabbro, hornblende-gabrro and diorite. Peridotite and pyroxenite are main rock types hosting Cu-Ni-PGE ores. The rock-forming minerals are comtposed of the assemblage of olivine, orthopyroxene, clinopyroxene, hornblende, plagioclase ly surrounded by orthopyroxene, clinopyroxene and plagioclase oikocrystals with and biotite. Olivine is normal- Fo being 80--85, which overlap minerals of the magmatic Cu-Ni-PGE sulfide deposits. Pyroxene is dominated by bronzite, endiopside ands- mall amounts of hypersthene and diopside. Plagioclase is usually characterized by rhythmic and reverse zones, consisting of An ranging from 50 to 70. Hornblende was formed at the last stage and enclosed olivine, pyroxene and plagioclase. According to these characteristics, the primary magma of such mafic-ultramafic intrusions must have been mantle-derived tholeiitic magma.