The Mosuowan area in the Junggar Basin has huge oil and gas resources. The reservoir accumulation process of the Badaowan Formation and the Sangonghe Formation is complex, and fluid inclusions are one of the main means. Based on the observation of the petrographic characteristics of fluid inclusions in 40 reservoir samples of Sangonghe and Badaowan Formations in 3 wells, the study of fluid inclusions was carried out. The results show that there are five types of inclusions in the study area, including gas-liquid two-phase brine inclusions, pure liquid brine inclusions, liquid hydrocarbon inclusions, gas-liquid hydrocarbon inclusions and gaseous hydrocarbon inclusions. From the Badaowan Formation to the Sangonghe Formation, the abundance of hydrocarbon inclusions decreases step by step.