1. The Fifth Geological Prospecting Institute of Heilongjiang Province, Harbin 150090, China;
2. College of Earth Sciences, Jilin University, Changchun 130061, China;
3. Liaoning Metallurgical Geology Team 404 Co., Ltd, Liaoyang 111000, Liaoning, China;
4. Bureau of Geology and Mineral Resources of Heilongjiang Province, Harbin 150300, China

Based on the geology of the deposit, the authors report herein the petrographic, microscopic temperature measurement and vapor phase composition of fluid inclusions of Qianshao forest farm Sb-Au deposit in Mohe area of Great Xing'an Range, and discuss the characteristics of fluid inclusions, time and spatial distribution of diagenesis and mineralization in Qianshao forest farm Sb-Au deposit. Results show that the ore-forming process experienced three stages: gray white quartz-pyrite stage (Ⅰ), gray black quartz-stibnite-pyrite stage (Ⅱ) and milky white quartz-less sulfide-carbonate stage (Ⅲ). The mineral fluid inclusions are mainly gas-liquid two-phase inclusions, and small amount of contain CO₂ three-phase inclusions. The ore-forming fluid should be the medium-low temperature and low salinity hydrothermal solution of the H₂O-CO₂-NaCl system. The ore bodies unloaded at this stage are the late stage of main metallogenic, and the northwest part of the ore bodies in this stage has great prospecting potential. According to the geological characteristics of the mining area, it is preliminarily considered that it was formed in the late Late Jurassic-Early Cretaceous.