The Nixintage magnetic iron deposit is situated in the east Awulale metallogenic belt, western Tianshan Mountains, Xinjiang. Several large-sized and medium-sized iron deposits have been found in this belt, and their genetic types as well as the contact relationship between them have become problems of heated debate in this area. A series of systematic researches have been conducted to discuss the ore genesis. Stratigraphic study and drilling projects reveal that the orebodies are hosted in basaltic trachyandesite, trachyandesite and pyroclastic rocks of Lower Carboniferous Dahalajunshan Formation, which contain 3 main iron orebodies. They are all concealed orebodies and occur in bedded and stratoid forms. Ore structures mainly include disseminated type, brecciated type, massive type and striped type. The main ore mineral in the iron ore is magnetite, followed by hematite, with minor pyrite and limonite and occasional geikielite. The main altered minerals in the wall rocks include chlorite, epidote and carbonate. On the basis of the study of ore fabric and paragenetic association of minerals, the metallogenic stages of the Nixintage iron deposit can be divided into two periods: magmatic metallogenic period and hydrothermal period. The orebodies and their wall rocks have similar chondrite-normalized REE patterns and rich LREE. The orebodies and their wall rocks also have similar trace elements characteristics, relatively rich in Th as well as U and poor in Nb, Ta and Sr. REE and trace elements charactersitics show that they are homologous. The study of petrography demonstrates that orebodies and their wall rocks are products of a developed basaltic magma rather then the products of andesitic magma. The general negative anomalies of Nb, Ta in the orebodies as well as their wall rocks and the negative anomalies of Ti in the wall rocks show that the ore-forming parental magma was probably the basaltic magma formed in an island-arc environment. In conclusion, the Nixintage magnetic iron deposit resulted from differential evolution of basaltic magma formed in an island-arc environment during the Carboniferous period. This magnetic iron ore deposit belongs genetically to volcanic magmatic-hydrothermal compound type.