Abstract: This paper systematically analyzed the fluid inclusion samples from outcrop and QZ?5well of the Middle Permian in Jiaomuchaka area of Qiangtang basin using fluorescent indicator, microscopic temperature and salinity measures. The result shows that there are four eriods of thermal fluid events that are all relevant to the hydrocarbon accumulation. in this reservoir. The burial historical curves indicate hat the four large scale processes of hydrocarbon accumulation occurred in the Middle Middle Jurassic (170×106~165×106a) before present), the Late Middle Jurassic (165×106~145×106a), the Late Late Jurassic to the Early Early Cretaceous (145×106~122×106a) and the Middle Miocene (22×106~7×106a). The Late Late Jurassic to Early Early Cretaceous is the main period of light oil accumulation, and the Middle Miocene is the main period of natural gas accumulation