Abstract: Chosing the Santanghu Basin in Xinjiang as an example,according to secondary fluid inclusions' facieology,salinity,homogeny temperature and character of associated hydrocarbon fluid inclusions in Jurassic reservoir,it is believed that the inclusions in the crack of quartz have formed at different fluids process and of different periods combining with the study of thermal evolution of the basin.The analysis show that there exist a heat event at the end of Jurassic,migrating by cracks from the deep stratum.Accordingly,the fluid inclusions have great significance in analyzing of the information about hydrocarbon migration,at the same time,it can provide heat events in geological history.The fluid inclusions bear the characteristics of multi-origin and multi-period,which are critical in studying the thermal and maturity history of hydrocarbon source rocks in basin.