Detailed studies were carried out on the fluid inclusions in quartz from Liba, Jinshan and Maquan gold deposits in Zhongchuan area, western Qinling orogenic belt. Three types of inclusions can be recognized in these deposits, i.e., CO-2-H-2O, CO-2-rich and aqueous inclusions. The ore-forming fluids are mainly of CO-2-NaCl-H-2O type characterized by rich CO-2, low salinity, high temperature and immiscibility. In combination with the previous isotopic data, the regional geological setting and the features of diagenesis and metallogeny, it may be concluded that the ore-forming fluids were closely related to the Mesozoic syntexis or re-melted granitic magmas and their intrusions. The ore-forming fluids were derived from the deep magma and mixed with meteoric and metamorphic water. Some materials derived from the deep area might have been involved in the ore-forming system.