In this paper, the fluid inclusions study was performed on quartz, sphalerite and calcite from the Sn-polymetallic orebodies of the Dafulou deposit. On the basis of optical observations and microthermometric data, six types of fluid inclusions have been recognized, such as single-phase gaseous fluid inclusions, single-phase salt solution fluid inclusions, two-phase vapour-rich fluid inclusions, two-phase liquid-rich fluid inclusions, three-phase CO2-rich fluid inclusions, solid(s)-bearing fluid

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... inclusions, etc. And it showed that water is the main component, for example the water content of quartz more than 1700 g/g, ranges from 1717 to 2320 g/g. The sphalerite has lower content than quartz, only 978 g/g. The calcite has lowest water content, i.e. 242 g/g and 324 g/g respectively. The gas component of inclusions mainly consists of CO2 and H2O. The main cationic consists of Ca2+, secondly Mg2+, K+ and Na+, only little Li+ and NH4+.