Abstract: The fluid inclusion of Yixingzhai gold deposits of Shanxi province are studied in detail. The six types of samples are granite, granite-porphyry, polymetallic sulfide-gold quartz vein, pyrite-gold quartz vein, gneiss and pegmatite. After studying the fluid inclu-sions, we discover out the four types of fluid inclusions in these samples:Ⅰ₁ liquid-rich in-clusion;Ⅰ₂ gas-rich inclusion;Ⅱ inclusion containing liquid CO₂ and Ⅲ multiphase inclu-sion composed of gas, liquid and danghter mineral.we also found the boiling fluid inclusion group in the ore samples, The boiling mechanim is related with an abrupt pressure drop when the ore-beating liquid went into the volcanic conduits and fracture belt.The both in-clusions characters in ore bearing quartz vein and subvolcanic rock vein are the similar, which shows the two kinds of liquids are cogenetic.