The West Tianshan area is located in the northern part of the Yili plate between the Junggar plate and the Tarim plate, and is an orogenic belt between the Junggar plate and the Yili basin. Porphyry deposits are mainly developed in Lailisigao’er area lying in the central part of the Late Paleozoic Biezhentao kokirqin arc island. The straight distance between the 3571 Cu deposit and the Lailisigao’er Mo deposit is less than 1 km. The ore-bearing porphyries are predominated by monzodioritic porphyry and granodioritic porphyry. Systematic petrological and mineralogical investigation indicates that the rocks are orogenic calc-alkalic granites formed under the conditions of anhydrous high-temperature (740～790℃) and high oxygen fugacity (10-9～10-11 Pa). Porphyries in the 3571 copper deposit were emplaced shallower than those in the Lailisigao’er ore deposit, as evidenced by the estimation of the pressure (the former being 140～230 MPa and the latter 300～430 MPa). In addition, they were derived chiefly from the crust contaminated by mantle materials. Based on geological setting and geochemical characteristics, it is inferred that the dykes outcropped in the 3571 copper deposit may correspond to the upper part of the dykes from the Lailisigao’er ore deposit, and therefore the area beneath the 3571 ore district should be regarded as a potential target for the prospecting of porphyry Mo deposit