Abstract: The tail high-velocity jet is one of the key factors affecting the morphology and stability of the cavitation on a supercavitating vehicle, with the cavitation shape being related to various factors including the intensity, flow, and angle of the tail jet. This study, conducted using an open gravity water tunnel and employing a time-sequence control method, investigates the coupling effects of the tail jet and ventilated cavitation. The primary focus is on analyzing the impact mechanisms of tail jet angle on the cavitation scale and the wake entrainment effect under different jet intensities. The findings indicate that variations in the tail jet angle and intensity lead to changes in the angle between the core velocity of the tail jet and the cavitation axis direction, thereby altering the coupling mode of interaction between the jet and the cavitation. Increasing the angle between the tail jet and the cavitation axis enhances the jet's recirculation and air replenishment effect, while decreasing this angle increases the deflating velocity, causing a reduction in cavitation size. Within a certain range, increasing the angle between the tail jet and the cavitation axis can enhance the cavitation stability. However, an excessively large deflection angle can result in jet impact on the cavitation wall, leading to cavitation breakup and collapse. The research outcomes provide significant support for the thrust vector control of supercavitating vehicles.