Abstract: With the ongoing development of society and advancements in science and technology, aerostats are increasingly playing a vital role in both civilian and military applications. As a crucial component of aerostats, understanding aerodynamic characteristics of capsules holds significant importance. In this study, taking the angle of attack and Reynolds number as independent variables, the dynamic force sensor and particle image velocimetry (PIV) technology were employed to gather quantitative data on the aerodynamic forces and flow fields of a rigid model of an aerostatic capsule. The impact of the angle of attack and Reynolds number on the aerodynamic and flow characteristics of the model was thoroughly analyzed. The aerodynamic analysis revealed that an increase in the angle of attack results in a higher drag coefficient across different Reynolds numbers. However, when the angle of attack is held constant, the drag coefficient decreases as the Reynolds number increases. The analysis of the flow field reveals that at an angle of attack of 0°, the separation zone on the model's upper surface initially diminishes before stabilizing. This behavior is associated with the disappearance of the separation bubble. In contrast, at a higher angle of attack (α=20°), the separation zone on the upper surface continues to expand with increasing Reynolds number, driven by the Coanda effect. Furthermore, at low Reynolds numbers, increasing the angle of attack leads to a gradual reduction in the separation bubble's size until it vanishes, causing the separation zone on the upper surface to progressively shrink. Conversely, at high Reynolds numbers, an increase in the angle of attack results in a sustained enlargement of the separation zone. This trend is one of the key factors contributing to the higher rate of increase in the drag coefficient with angle of attack at high Reynolds numbers compared to low Reynolds numbers.